Big Hero 6 ends with a delightful post-credits scene. As Fred goes through his family’s belongings, his father, who both looks like and is voiced by Stan Lee, shows up and says they have a lot to talk about. Stan Lee cameos are always fun to see, and his presence in this movie makes it clear that this is, in fact, a Marvel movie. And Marvel movies are all interconnected in some way.
After all, there was a scene in Guardians of the Galaxy Vol. 2 where Stan Lee can be seen talking to a group of aliens known as the Watchers. He mentions a few of the cameos he’s made over the years in the MCU, making it clear that Stan Lee always plays the same character when he pops up in Marvel movies. If this theory holds true, then that means Stan Lee’s watcher informant also made a trip over to San Fransokyo.
Granted, Stan Lee also appeared in movies outside of the MCU like Sam Raimi’s Spider-Man trilogy. Perhaps Stan Lee’s character has the ability to travel through the multiverse to go to other Marvel universes. It could be possible for the multiverse in the MCU to be tampered with, allowing Big Hero 6 to come through and enter the Marvel Cinematic Universe properly at some point.
Written by: Looper