Black Widow and The Hulk aren't the only heroes who found love in a hopeless place.

Although many of the Avengers grow apart in Captain America: Civil War, two of them manage to grow closer: Vision (Paul Bettany) and Scarlet Witch (Elizabeth Olsen). E! News has an exclusive first look at a bonus feature from the Marvel movie (available on Digital HD Sept. 2 and Blu-ray Sept. 13), in which the stars explain how their characters' relationship was almost predestined.

"What I love about Vision, he's sort of on his own quest, which is to understand human beings," Bettany says of his character, who was accidentally brought to life via an Infinity Stone in The Avengers: Age of Ultron. "He realizes that loyalty has got to come through love—real loyalty—so I think that he's very intrigued by what love is."