There were a couple of really fun cameos in Thor: Ragnarok, and some of them came from some rather large names in Hollywood. Those cameos are considered spoilers — mostly because you want to see them play out for yourself, but also for their content. They are also part of what director Taika Waititi would do if he made the hypothetical fourth Thor movie, according to Cinema Blend. However, that's also a bit of a spoiler, so we'll see you after you've seen the movie.
After defeating the fire demon Surtur, Thor (Chris Hemsworth) returns home to Asgard to see a play being put on of Loki's (Tom Hiddleston) "death" in Thor: The Dark World. The play takes some creative liberties, what with the very not-dead Loki impersonating Odin at the moment, and also some great cameos such as Sam Neill playing Odin, Luke Hemsworth as Thor, and Matt Damon as Loki. Neill and Jeff Goldblum were famously in Jurassic Park together, and Cinema Blend asked Waititi about the reunion — which led into a conversation about how he would open Thor 4:
"I would have loved that. I don't think they were around at the same time. That would have been amazing just to somehow make that work. It would be awesome if we somehow got Laura Dern in there, as well… Thor 4, exactly. All of them go back and do the play again. It's a new play about Asgard's destruction. That might be a great way to start that film."
Laura Dern reenacting Cate Blanchett's Hela in a "Shakespeare in the Park" rendition of Thor: Ragnarok is not a thing I knew I needed until this very moment.
Summary: Imprisoned, the mighty Thor finds himself in a lethal gladiatorial contest against the Hulk, his former ally. Thor must fight for survival and race against time to prevent the all-powerful Hela from destroying his home and the Asgardian civilization.
Thor: Ragnarok, directed by Taika Waititi, stars Chris Hemsworth, Tom Hiddleston, Cate Blanchett, Jeff Goldblum, Idris Elba, and Mark Ruffalo. Check it out in theaters now.