Event Horizon takes place in the Warhammer 40k universe.
The screenwriter even acknowledged that it was inspired by 40k! One of my favorite horror movies, even though it’s flawed.
That Isayama (creator of Attack on Titan) has been planning for the anime to be a sequel to the manga rather than an adaptation of it.
There’s a lot of evidence to support this but the one piece that kind of kicked off the theory is the fact that Attack on Titan copied a lot from a game called Muv-Luv. The ending of Muv-Luv 2 is even nearly identical to the ending of Attack on Titan. In Muv-Luv 3, they introduced multiple timelines and it had a different ending. So if Isayama can copy and ending once he can probably do it twice.
I like to imagine The Matrix (1) as a sequel to The Terminator 1&2.
While I mostly keep watching the show out of some kind of morbid fascination, I’ve always believed that Rick literally is Morty in some way, or at least that was the originally intended big reveal.
It’s just too on brand for the shows sense of humor, and at least in the first season they were really into deconstructing or mocking a lot of classic Sci Fi tropes that while not that well known to the average viewer, any Sci Fi nerd would instantly recognize (in other words, Futurama but with dick jokes), and what fits better into that mold than the Grandfather Paradox?
When I have mentioned this, a few people have said that Rick “refuses to do time travel” or similar, but again what is more on brand for the show than for Rick to just go “Haha fuck you, I always knew how to time travel, but I don’t do it because reasons!” or some similar reversal. I mean they spent the first season loudly saying they weren’t a serialized story, while dropping breadcrumbs about a grand serialized story.
Apparently the recent anime crossover semi-confirms this theory, but I can’t be arsed to watch it, and I don’t think it is canon anyways (or if it is, it’s from dimension D-414 or something).
I like the theories that the SpongeBob characters are nuclear mutants and represent the seven deadly sins.
Hans from Frozen was turned evil by the rock trolls.
In the song Fixer Upper, they say ‘Get the fiance out of the way and the whole thing will be fixed.’ Shortly after, we see Hans be evil for the first time in the film.
In addition, at the beginning of the film, the grand troll notes that it’s lucky the magic hit her head and not her heart, because the head can be persuaded. So we have motivation, capability, and a stated intent.
Snowpiercer is a sequel to Willy Wonka and the Chocolate Factory.
