10 Off Screen MCU Moments We All Want To See
6. Hulk's Nightmare Vision - Avengers: Age Of Ultron
Though Scarlet Witch (Elizabeth Olsen) ends up joining the Avengers during Age of Ultron's third act, she and her brother Quicksilver (Aaron Taylor Johnson) are initially presented as antagonists hell-bent on revenge against Tony Stark (Robert Downey Jr.) and his comrades.
Scarlet Witch uses her abilities to attack the heroes with horrifying visions, such as Stark witnessing an illusion of Earth being successfully invaded by the Chitauri.
Wanda also subdues Bruce Banner by forcing him to witness a vision, one which causes him to uncontrollably Hulk-out, requiring Tony Stark to stop him with his new Hulkbuster armour.
Yet unlike with Stark, we never actually see the content of Banner's vision, though the implication is clearly that it's something intensely disturbing enough to make him transform into the Hulk.
Given that all of Wanda's other visions were either reminders of an horrific past or premonitions of a painful future, it's reasonable to assume that Banner may have been witnessing his worst nightmare: losing control of his abilities and causing a mass catastrophe.
Whatever the content, it's certainly a shame we didn't get to see it, because anything traumatic enough to freak out the Big Green Guy sure must be gnarly alright.