God Of War Ragnarok: this gets bonus points because it's not just an out of bounds area but you unlock the ability to destroy it later.

Dark Souls 2: you go through so many fights just because you can't jump over this

(The reason I consider this mixed is because sometimes the hook for a sequel is actually cool & it’s disappointing it never got continued but most of the time it’s… not but ultimately it’s up to you)

Black Adam (2022): The end of the movie teases a potential fight with Superman in the near future (as per the Rock’s goal) but after the studio rebooted the world & Superman was recast we’ll never see if the hierarchy of power really changed.

Shazam (2019) & Shazam Fury of the Gods (2023): In both credits scenes we see a teaser for a team up between Sivana & Mister Mind, in the sequel it’s turned into a comedic bit with Sivana complaining when they’re going to actually escape. Much like the Superman vs Black Adam teaser this went nowhere.

Morbius (2022): We get Vulture transported from the MCU interacting with Morbius himself saying they should team up but with the SSU basically dead in the water they’re never going to follow this up.

The Amazing Spider Man 2 (2014): The Various members of the sinister six get teased in this scene with the credits even being dedicated to showing off their weapons but even in Garfield’s appearance in No Way Home we never get a follow up to this.

Super Mario Bros (1993): Daisy comes in at the end carrying a Gun with some apparently exciting news we never get to hear. There were some webcomics attempting to make unofficial sequels but they never got finished.

The League of Extraordinary Gentlemen (2003): Throughout the movie we get told by Allan Quatermain that ‘Africa will never let him die’ & in a cut ending we saw a shaman stand over his grave seemingly foreshadowing his revival possibly following the plot of the second volume (which was teased by a newspaper in a scene showing Volcanoes on Mars) but due to its failure & the cast & crew basically dropping out of the industry it was never followed up on.

The Predator (2018): At the end we get a showcase of a power armour suit designed to kill Predators but it’s never been mentioned or followed up on since.

Utopia (2013-2014): The series ends on a massive cliffhanger with the Network apparently under Wilson’s command with 5 containers of the flu left, the rest of the group being captured & Arby waking up from his comatose state. Unfortunately none of these plot threads were continued due to Channel 4 cutting the series.

Fionna and cake - during episode "Jerry" We closer to the end found out this "Jerry" Is actually Lich, and just seeing him makes you jump in fear of you watched adventure time.

Gravity Falls Journal 3 - I mean... I clearly didn't expected for book to jump scare me with page like this.

Buzz Aldrin, one of the first man on the moon, talking to Optimus Prime in Transformers 3

Toru Iwatani, the creator of Pac-Man that goes on to revolutionize arcade game (and probably video game in general), running away from Pixel’s Pac-Man in the movie Pixels. Before this, he treated the being like his son.

1. The Others (Pluribus)

Humanity is subsumed into a hive mind via an alien virus, save for 13 people who are immune for unclear reasons. As it currently stands, They have no trace of their hosts' original personalities, only their memories; one of the survivors, a Paraguayan man named Manousos, outright considers them to be demons that stole humanity's souls. Even still, They put on unnervingly convincing performances at times - it takes Carol until the season finale to come to terms with the fact that "Zosia" isn't and never was the real Zosia, just The Others using her body (a gender-flipped version of Raban, the protagonist of Carol's series of fantasy-romance novels that she originally intended to be a woman and implied to be Carol's ideal woman physically), the memories of Carol's dead wife Helen, and humanity's collective knowledge of science and psychology to simultaneously manipulate and comfort her, as They are biding time until they can successfully use her frozen eggs to synthesize a way to Join her to Them as well. It's this realization that drives her back to Albuquerque to work with Manousos to try to find a way to cure humanity.

1. Nikki (Obsession)

Nikki's original consciousness is overruled and trapped within her body when her coworker Bear makes a wish that she would love him "more than anyone in the world". In the original Nikki's place, "Freaky Nikki", a deranged and obsessive alternate personality completely devoted to Bear, takes over instead. The original Nikki occasionally does manage to break out, usually desperately begging Bear (or whoever) to kill her before Freaky Nikki takes control again and makes her do violent and/or bizarre things.

1. The Black Boxes (Fallout: Season 2)

Hank McClean's goal in Season 2 is to perfect the prewar "Black Box" mind control devices designed by Robert House, but runs into problems where the host dies when they start to resist the orders given by the device. He eventually figures out that the only way to achieve success is to forcibly overwrite the original host personality, using a prewar Enclave personality template to make them into an ideal corporate office drone: kind, non-confrontational, and helpful. His first successful test is on the Snake Oil Salesman, and he eventually successfully converts over 20 wastelanders, including raiders, Legion soldiers, and even NCR Ranger Biff, who Lucy knew and was friendly with; this is what convinced Lucy that her father is truly beyond saving.

Aliens aren't responsible for their children. The task of becoming intelligent adults is either instinctual or someone else's problem.

1). Ben 10:
Xylene (an Uxorite) has a throwaway line about how her species doesn't raise children. This makes Max's responsibility (to his grandchildren) confusing to her.

2). Resident Alien:
Harry's species are octopus-like aliens. In order to reproduce, one mate is eaten from the inside by hundreds of larva. These offspring are left in the "ice-wind desert" to see who is strong enough to survive. The weak are eaten by their larger siblings for sustenance.

3). Dragon Ball:
Saiyans are perfectly capable of forming human-like family units. It's just not something most are interested in. In fact, if a baby is "too weak" to bother raising properly, Saiyans ship the infant to a far-off planet. These "infiltration babies" are expected to instinctively subjugate and wipe out the planet's native people.

4). Known Space:
The starfish-like "Jotok" spend their early life as free-swimming larva. At a certain age, five Jokoki merge together, with each larva forming a "limb." Now terrestrial, the juvenile can either be "adopted" and "civilized" by an adult. Or spend the rest of their life as a feral predator.

5). Homestuck:
"Trolls" are born from an ant-like "mother grub." The mother grub takes genetic material (donated from numerous adult trolls) and uses it to lay thousands of eggs. Most "grubs" never make it to pupation. And after pupating into a humanoid, adolescent troll, the child is put through a series of high-mortality "trials."
If a young troll emerges through the trials intact, they are allowed to bond with a "lusus naturae." Or one of many different species of alien fauna that imprint on and raise the young troll. Most trolls spend their entire childhood having never met an adult. After a failed rebellion, fully-grown trolls were banished from the homeworld to fuel their ever-expanding space empire.

Judy Garland (The Wizard of Oz)

Her life was nothing short of horrific; on set, she was abused and even beaten by Fleming himself.

She was forced to smoke a great many cigarettes and was repeatedly told she was ugly, even being called "the little pig with pigtails."

Judy was led to believe she had been given a trailer of her own, but it turned out to be nothing more than a publicity prop; she wept in a corner, finding comfort only from the Wicked Witch's stunt double.

Brandon Lee (The Crow)

Brandon was killed during the filming of the movie, and this caused James O'Barr—the creator of the original comic—to fall into a second depression.

James blamed himself for both his girlfriend's death and Brandon's death.

Raul Julia (Street Fighter)

Despite having stomach cancer, Raul decided to take on the role of M. Bison anyway, partly to make his children happy and spend more time with them.

Lois (Malcolm in The Middle) she constantly treats her kids like shit, actively goes out of her way to sabotage them (the final episode of the original show is literally her sabotaging Malcolms future by turning down a high paying job on his behalf, and the show portrays her as being right for it), theres a lot more shitty things she did

Horrid Henry's Parents clearly favorite their youngest child and treat Henry's like shit, theres literally an episode where the mom scolds Henry for literally saying hi to his brother

The couples are:

Gumball and Penny from the amazing world of Gumball.

Rose Quartz and Greg Universe from Steven Universe.

Fluttershy and Discord from my little pony friendship is magic.

The Persistent Suitor: A guy who is after the girl and just wont take no for an answer. Nowadays we just call stalking and harassment, but it used to be romantic. Example: The Notebook (2004), Noah asks Allie out while she's on a date with another man. She refuses, but he threatens to let go and fall unless she agrees to go out with him.

Comedic Woman On Man Violence: Mostly seen in anime, recently it has decreased a lot but years back every show had a woman hitting a guy and showed it as funny. Example: Toradora!, where the quintessential tsundere, Taiga, beats up the MC regularly.

Kid Bags Adult Baddie: I remember a few of these, sometimes it was to show how cool and awesome a kid was because an adult woman fell for him, now it's just seen as problematic shit. Example: Blank Check, the woman likes the kid and kisses him telling him to look for her in 10 years.

1. Lord of the Rings. Sauron assumed that nobody would ever want to actually destroy the Ring. He was convinced that the good guys were planning to use the Ring against him, and thus could not conceive of the idea that they would be planning on taking the Ring to Mordor to throw into Mount Doom.
2. Columbo. In one case, the culprit kills her husband and makes it look like kidnappers did it even after she delivered the ransom. Her stepdaughter later blackmails her to keep quiet about what she knows, and the culprit uses the "ransom money" to do it, but it was a trap, the stepdaughter was working with Columbo and the money was all the evidence they needed to arrest her. The culprit could not conceive of the idea that somebody would care more about getting her father's killer brought to justice than money.
3. Sherlock Holmes: A Game of Shadows. During their final confrontation, Moriarty knows that because of Sherlock's injuries there was no way Sherlock could beat Moriarty in a fight, and knows that Sherlock would know it too. However, he did not anticipate that Sherlock would be willing to take down Moriarty in a way that would lead to both of them falling to their deaths.
4. Star Trek. In "Mirror, Mirror" several members of the Enterprise swap places with their counterparts from another universe where they're all evil. The main characters are capable of pretending to be cruel and ruthless for long enough to escape the Mirror Universe, but we see that the Mirror versions in the prime timeline just kept acting like thugs and got discovered and imprisoned immediately.

Rudeus from Mushoku Tensei/Jobless Reincarnation: A 34-year-old shut-in pedophile from Japan who is reincarnated into a fantasy world as a newborn retaining all of his memories. He constantly sexually harasses women, grooming and molesting two underage girls he grows up with, and has sex with both of them when they are 15. Later he marries both of them, forms a harem with a total of three wives and faces no consequences.

Anton Chigurh from No Country for Old Men: A ruthless psychopath hitman systematically outsmarts the law. He executes everyone in his path, escaping with a briefcase full of stolen drug money while a weary sheriff is left powerless.

Louis Bloom from Night Crawler: A sociopathic, manipulative unemployed petty thief in Los Angeles who steals scrap metal and copper wire finds his calling as a freelance crime journalist, stopping at nothing, including sabotaging rival cameramen, tampering with crime scenes and letting his associate die to build a successful local news empire with zero consequences.

(Breaking Bad)

Beginning at the end, you quickly dive into this recently shattered mundane man’s life and show how a lifetime of getting beaten down finally gives way to a cancer diagnosis and a Hail Mary voyage into a criminal
Underworld to provide money for a family he believes he’ll soon be leaving with a mountain of medical dept.

(psych)

Lifelong slacker genius Shawn Spencer suddenly finds himself pretending to be a psychic and working on a police investigation involving murder, mysterious disappearance, and an introduction to a quickly beloved wide range characters. Playing a serious investigation as silly as possible along with his childhood best friend.

1. Mary Jane (Spider-Man 2): MJ got engaged to John Jameson after they dated in something that I'd consider a rebound. He was a genuinely cool guy and was left at the altar when she decided she still loved Peter, not cool.

2. Jim (The Office): After he moves away from his original workplace he gets into a relationship with Karen while trying to forget about his feelings for Pam. After a while he goes back to his original workplace and who would've guessed, dumps the person who many would consider a dream girlfriend for Pam. Even though I love Pam I can't stop myself from feeling bad for Karen as she truly loved him and deserved better.

3. Betty Ross (The Incredible Hulk): While Bruce Banner is on the run after his failed gamma experiment, Betty starts dating Doctor Leonard Samson, a really chill and cool guy who ends up being cheated on because Betty's true love decided to come back after more than 5 years. Shitty people all over the place man.

Destroying other universes - Marvel Comics: Events called Incursions start occurring all over the multiverse, where two alternate versions of Earth violently collide and destroy both universes in their entirety. The only way to prevent an incursion is for one universe to destroy the Earth of the other universe, killing billions to save trillions. Unfortunately, it turns out even that only buys time, as even if a universe spares itself from the Incursions, the multiverse as a whole was still dying.

Allowing Canon Events - Spiderverse: Spider-men across the multiverse are united by the multiversal thread known as the Web of Life and Destiny. Part of this is that all Spider-men are destined to live very similar lives: All are bitten by a radioactive spider, all experience the death of an uncle/father figure that teaches them responsibility, all fail to save a police captain who they become close to, all that have relationships with a Gwen Stacy variant have that relationship end in tragedy. One job of the multiversal Spider-Society led by Miguel O'hara is to make sure canon events happen at any cost: Because according to him, any canon event being broken inevitably results in the destruction of that Spider-Man's universe. This means preventing the loved ones of countless Spider-Men from being saved, since them living would "break canon" and doom the universe.

Letting the villains win - Gameoverse: The Gameoverse is filled with countless planets that seem to function under video game rules, with a heroic player character that has to fight through many levels and beat an evil final boss. The twist is that once the final boss is beaten, the game is now over, resulting in the violent destruction of the now obsolete game world. The protagonists are a team of former player characters who survived the destruction of their own games, with goal of sabotaging heroes and aiding villains in other game worlds because helping the bad guy win is preferable to letting everything be destroyed.

Sacrificing teenagers to horror movie monsters - Cabin in the Woods: There are evil eldritch beings lying in wait to destroy our world. A secretive organization works to keep them contained with a special ritual, where 5 teenagers fitting classic horror movie archetypes must be hunted and killed by a supernatural slasher/monster. As long as all victims except the "Virgin"/Final Girl are killed, the eldritch beings are sated for one year, otherwise they destroy the world. Two of the protagonists survive their engineered horror scenario, and we see just how real the ritual was as a giant hand bursts from the ground and kills them both.

Procedure 110 Montauk - SCP Foundation (No image included because the article doesn't have any): 7 women are captured by a cult known as the "Children of the Scarlet King", and anomalously impregnated with the eldritch god's "children". Though the women are freed from the cult and recovered by the SCP Foundation, they begin giving birth one by one to increasingly powerful and dangerous monsters. Believing the seventh woman will give birth to a monster so powerful it would render humanity extinct, or perhaps even one that could bring the Scarlet King himself into reality, the Foundation resorts to using Procedure 110 Montauk to delay the birth for as long as possible. Though the details of what 110 Montauk entails are entirely censored to us, we do know that it is incredibly horrifying and torturous, the procedure NEEDS the suffering to function, and the people who carry out the procedure often choose to erase their own memories afterwards due to the guilt. However, there's simply no other way to prevent the birth of the Scarlet King's last child: No medical procedure or magical ritual can kill the fetus in the womb, and killing the mother just results in the child being born anyway. The worst part: Though the final mother's age is redacted, from the length of the redaction you can tell it's between a double digit and SINGLE digit number, meaning there's a very high chance this is all happening to a CHILD.

Erin Harson from the 2011 film "You're Next" - She's the final girl of this horror movie. Everyone else in this movie is some rich snob asshole at a rich snob family reunion, and she is the girlfriend of one of them. She's quite different from the rest of these people as she was raised on a survivalist compound and knows how to handle herself under extreme duress.

When the rich family starts getting picked off by masked hunters, she starts hunting them back. And she double taps everyone one she downs. Only horror protag that MAKES SURE the killer is dead.

Biff - Back to the Future - "Now why don't you make like a tree, and get outta here!" - Make like a tree and leaf.

Joey - Friends - "It's a moo point." - It's a moot point.

Peter Parker (Marvel) - Peter Parker got the iconic black suit during the 1984 Secret Wars crossover event when his original red-and-blue costume was completely destroyed in battle.

Izuku Midoriya (My Hero Academia) - Deku became "Dark Deku" during the Dark Hero Arc because he left U.A. High School to fight All For One alone and keep his friends safe.

Mark Grayson (Invincible) - Mark Grayson gets the dark blue and black suit from superhero tailor Art Rosenbaum because it marks a major tonal shift into a darker, more mature phase of his life and superhero career.

James Woods, Hades voice for Hercules. Famously, James Woods loved the role of fast talking Hades from the disney movie Hercules so much that he has since voiced every single iteration of him, from video games to TV, (for nearly no money, not sure if zero)

David Hayter, VA for Solid Snake, MGS1 Gamecube. When David found out they couldn't afford all of the original game's voice actors, he purposefully took a 50% pay cut to bring them back.

Whip (King of Fighters)

Blade (Marvel)

Bow (Masters of the Universe)

"The universe" is inside (or composed) of a living being. That being was born and may someday die.

1). The Genesis Frog (Homestuck):
^{TLDR: Homestuck is about a magic videogame that creates universes. Which are frogs.}

• Homestuck is about "John Egbert" playing a new videogame with his friends. After they install "Sburb," they discover the game is magical. Installing the game summons deadly meteors to your location, and the only way to survive is to leave Earth and escape "into" the game.
• Inside of a game-generated pocket universe [second image], players go on a variety of quests. Like fighting monsters, or helping NPCs with various problems. But the most confusing "quest" involves cloning and breeding frogs.
• John and his friends try to figure out what the "point" of Sburb is. Why did someone create a videogame that tries to kill its players? Even if people "discovered" it, why did the publisher release the game if doing so would doom human civilization?
• Well, it turns out that the "frog quest" is the most important part of the game. Apparently, if you breed a "genetically perfect" frog, you create a "Genesis Frog" [first image]. Doing so is the single most consequential thing humans will ever do.
• Because a healthy, adult Genesis Frog contains an entire universe inside of them. Yes, every universe (including the ones humans come from) is just a colossal, magical frog. And the only way to create one is to play and beat Sburb. These frogs eventually die, necessitating the cycle of new players (inside the frog) playing Sburb again, creating new universes.

2). Simon Petrikov (Adventure Time: Fionna and Cake)
^{TDLR: A "wishmaster" illegally created a universe, and stored it inside a guy's head.}

• Simon was a normal human who happened to find a magic crown. The corrupting influence of the crown turned him into the immortal "Ice King." Allowing him to survive the collapse of human civilization, albeit lonely and insane. Centuries later, Simon is "cured" and reverts back to being a mortal human.
  
• The problem is that "the almighty Prismo" had stored something inside of Simon while he was still the Ice King. Prismo is responsible for creating new offshoot realities by granting wishes. For example, if someone came to him and wished for "world peace," he would create a new (peaceful) version of the wisher's home reality. Prismo would send the wisher there, leaving their original (unaltered) reality behind.
• But Prismo grew disillusioned with creating realities for other people. And created his own "new" reality loosely based on his friends', Finn and Jake. But he's not "supposed" to do that. So, he used his almost-limitless power to "hide" this illegal reality inside of the Ice King's otherwise empty head.
• When Ice King was cured, this universe was trapped "inside" of Simon. This greatly concerns Prismo, Simon, and the people living inside of him. Because as a regular human, Simon will one day die (taking the universe with him).

3). Eternity (Marvel):
Sometimes Eternity is the living embodiment of time. Sometimes he's the universe itself. Eternity can (in some continuities) be killed, resulting in the destruction of at least one reality.

Randall Clark (Fallout: New Vegas) He helps survivors, protects innocent refugees, wages a one-man war against the murderous Vault 22 survivors, and eventually watches over a group of children from a distance. He secretly leaves them supplies, survival knowledge, warnings, and guidance so they can grow up safely. While the eventual tribes in Zion turn him into a religious/mythological figure, they know the old man behind the legend. Clark ends up dying alone and forgotten, which is what he wanted. He felt the truth would’ve been disappointing.

Talion (Shadow of War) Held back the forces of Mordor for decades and gave Middle Earth a chance to defeat Sauron and nobody ever knew what he had to endure alone.