The rumored World War Hulk movie would help fix a lot of the MCU's Hulk problems, but for a successful adaptation of that story to happen, Marvel needs to get rid of the Smart Hulk. While Mark Ruffalo's version of the Hulk never got a solo film in the MCU, the character was present in all of the Avengers films – plus, he had a sort of co-lead role in Thor: Ragnarok. The Taika Waititi film tried to add a new spin on the character and brought a more humorous relationship between Hulk and Banner. However, Avengers: Infinity War chose not to feature the Hulk for most of the movie, and by the time audiences saw the character again in Avengers: Endgame, he was now the Smart Hulk.
Inspired by Hulk's time as «Professor Hulk» in the comics, MCU's Smart Hulk is seemly the perfect balance between Bruce Banner and the Hulk, in which Banner has the agency while keeping the Hulk form. The Smart Hulk reveal was one of the most surprising moments of Endgame, especially because Bruce Banner and Hulk were on bad terms in Infinity War, a film in which the Hulk decided not to appear after the fight with Thanos. Banner never got into detail about how he and Hulk had come to that resolution, and the true origin of the Smart Hulk remains a mystery.
Related: MCU's Phase 4 Shows Hulk Has Done What Thanos Could Not
The Smart Hulk situation became even stranger during the MCU's Phase 4. In the Shang-chi and the Legend of Ten Rings mid-credits scene, which happened after Endgame in the MCU timeline, Bruce Banner appeared in his human form, which was already a surprising event. However, in the She-Hulk trailer, it's the Smart Hulk who's training Jennifer Walters. Not only that, but the Smart Hulk in She-Hulk does not have his arm injury, which
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