"That's a really bolstering sort of thing to happen," Hoult tells EW. One of the first Lex Luthors that Nicholas Hoult remembers seeing as a kid is the one played by Michael Rosenbaum on Smallville, the CW series featuring Tom Welling as Clark Kent/Kal-El in a high-school coming-of-age setting.

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.