Robert Downey Jr. As Lex Luthor? In McG’s ‘Superman’ It Would Have Happened.

I completely forgot that McG was in the running for a Superman movie. He was among a cast of thousands all vying for the throne before Frat Boy Rock himself, Zack Snyder, snagged the opportunity. God only knows how Snyder’s “Superman: A Slow Motion Pop Video”  is going to turn out, but McG has recently spread some deets on how his version of the mythos would have went down.

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McG was attached to “Flyby,” a rebooting of the “Superman” series that, thanks to a boldly different take from screenwriter  J.J. Abrams, would have made wholesale changes to the origins of Superman, his home planet Krypton, and his main nemesis Lex Luthor. McG ended up exiting the project when the studio was adamant about shooting in Australia. He blames his fear of flying for being “thrown off” that project, calling it his “rock-bottom” moment, which would eventually lead him to taking on his next film, the plane-crash drama “We Are Marshall,” as a catharsis.

McG says no final casting decisions had been made on the film, though he did mention one name that, we admit, we hadn’t heard before. “We had  Robert Downey Jr.  locked up to be Lex Luthor, which I think would have been extraordinary,” McG enthused. But his pick for the Big Blue Boyscout is actually much less of a surprise. “Ironically, we liked  Henry Cavill  a lot, but we hadn’t cast him yet,” he says of the actor currently wearing the tights in the upcoming “Man Of Steel.” “J.J. wrote the script, and we got that to a really good place in the end,” he says of the film, the first in a proposed trilogy. “But I’m to blame for [the film not happening].” While we’ve heard no shortage of superhero movie casting over the years, the idea of a then-low-key Downey Jr. as Lex Luthor is enough to make us wonder a whole score of what-if fantasies, particularly considering his own subsequent ascension to the top of the A-List following “Iron Man.”

RDJ? Couldn’t have been worse than Kevin Spacey. Yeah, I went there!