Avengers: Infinity War & Endgame - 10 Major NEW Reveals From The Filmmakers

It's no secret that the original plan was for "Smart Hulk" to debut in Avengers: Infinity War. As we've seen in a leaked deleted scene, Bruce Banner was going to come to an agreement of sorts with his angry other half to merge and bust out of the Hulkbuster armour to battle Cull Obsidian.

That ended up being cut, and Markus has now elaborated on why. "This scene did originally involve the birth of Smart Hulk," he said, referring to that final battle with The Avengers in Wakanda. "Filmed it and everything. Ruffalo was genius, arguing with himself. Didn't work for beans."

However, as you might expect, this led to some problems for Avengers: Endgame, and the writers confirmed that those early scenes with the heroes on Earth and Titan II had to be reshot to account for the fact Bruce Banner was still human and not the intelligent version of the Green Goliath.

The Russo brothers would later add that, "The personality that now exists is a new entity…it is a merger of Bruce Banner and the Hulk." That confirms Smart Hulk is neither just a super strong version of Bruce Banner or The Hulk with Bruce's mind; as the filmmakers explain, he's something entirely new.