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Diane Keaton

Forget the capes. This hero wears a robe.

Forget the capes. This hero wears a robe.

While "Avengers: Infinity War" breaks box office records, "Deadpool 2," the snarkily self-referential anti-superhero comedy starring Ryan Reynolds, threatens its strait-laced cousin's throne this weekend. Meanwhile, "Solo: A Star Wars Story" waits in the wings, hoping that the original tale of late 20th-century cinema's most beloved curmudgeon can prove that the creaky franchise can still put tushies in seats.

But as the official summer movie season gets underway in earnest, it's quite possible that each of these boys-and-their-toys adventures will be outperformed - at least proportionately - by a little documentary that is emerging as an early...