Zack Snyder’s Star Wars-meets-Dune sci-fi epic Rebel Moon dropped its first teaser trailer Tuesday, and the director is already revealing plans for another, longer version of the project — including roughly an hour of additional footage.

Now before we get to Snyder’s explanation, one might wonder why Rebel Moon needs a different version in the first place. The Man of Steel filmmaker isn’t putting out a Warner Bros. superhero title that is being forced to fit some restrictive theatrical distribution requirements. Rebel Moon is for Netflix, and is already being released as a two-part movie. Presumably, if Snyder wanted Rebel Moon to be longer — and given he already had the creative freedom to shoot the additional footage and the budget to finish it with visual effects — why not just release that version on the streaming service instead and then stand by it?

What’s also unusual is that...