"Superheroes" adds to Slamdance’s expanding archive of some of the best non-fiction films we’ve seen at festivals. The cogent work follows the travails and (mis)adventures of real-life superheroes (RLSH) in major cities throughout the US—including the SLC. Characters as silly sounding as Master Legend and Mr. Extreme fight for justice alongside the more seriously dubbed likes of Omen, Conundrum, and a nice Jewish boy named Chaim (life in Hebrew).