Guardians of the Galaxy Vol. 3 writer/director James Gunn confirmed a fan theory surrounding the movie's villain, the High Evolutionary.
In an article from The Direct concerning an interview between Strip Marvel and Guardians 3 VX artist Miguel Ángel Acevedo Montserrat, Montserrat said Drax the Destroyer can be seen saving the High Evolutionary from the exploding Arête Laboratories among the animals that were escaping as well. As a response to the article, Gunn posted on Twitter, "For people who want the spoiler, what's pointed out in the article is very much in the movie." That said, it's currently unknown if the High Evolutionary will return in the Marvel Cinematic Universe.