Avengers: Endgame - 33 Easter Eggs & References Explained
25. Professor Hulk
One of the most entertaining surprises in Endgame is that, after spending 18 months in a gamma lab, Bruce Banner has found a way to merge himself with The Hulk, retaining both the intellect of Banner and the brute strength of The Hulk.
But this wasn't a mere creation for the movie - Marvel Comics have tinkered around with the notion of melding these two characters together for years.
The most famous iteration from the comics - and the one Endgame is most obviously inspired by - is surely the Merged Hulk, which was later ret-conned into The Professor.
This version of the character found a fairly harmonious middle-ground between Banner and The Hulk, though other versions throughout comic lore haven't been quite so fortunate, with The Hulk even trying to lock Banner out completely in some instances.