“Werewolves” is your basic, everyday lean-and-mean dystopian werewolf-as-zombie action thriller, with elements lifted from the pandemic and the “Purge” films. It’s not a good movie, but it’s a tight little time passer. Frank Grillo, who’s at the center of it (playing a ripped bruiser who is also…a molecular biologist!), has a way of making any pulp movie better. He’s like a brainy Charles Bronson. And the plot is simplicity itself, and efficiency too: On the night of a supermoon (that’s when the full moon comes closest to Earth), people all over the globe are transformed into towering werewolves if they look at the moon for so much as one second. Talk about a good reason to stay home and stream something.

How are the werewolves? Cheesy in a fun way. As in self-consciously old-fashioned, or maybe just lavishly threadbare. A lot of people now...