Speaking to Hoult on the set of Superman last summer, the actor explained how even during the process of going after Batman and Superman, it was Lex Luthor that subtly called to him. “It’s no secret that I read for Matt Reeves’ movie and for this film with James and I feel very fortunate the way things [played] out,

In fact, the idea of Lex Luthor and the Joker teaming up is the subject of the classic animated movie The Batman/Superman Movie: World's Finest, which marks the first crossover between Superman: The Animated Series and Batman: The Animated Series all the way back in 1997.