Jake Coyle|Associated Press

It’s a bird, it’s a plane, it’s a … a purple and orange shape-shifting chemical compound?

Writer-director James Gunn’s “Superman” was always going to be a strange chemistry of filmmaker and material. Gunn, the mind behind “Guardians of the Galaxy” and “The Suicide Squad,” has reliably drifted toward a B-movie superhero realm populated (usually over-populated) with the lesser-known freaks, oddities and grotesquerie of back-issue comics.

But you don’t get more mainstream than Superman. And let’s face it, unless Christopher Reeve is in the suit, the rock-jawed Man of Steel can be a bit of a bore. Much of the fun and frustration of Gunn’s movie is seeing how he stretches and strains to make Superman, you know, interesting.

In the latest revamp for the archetypal

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