If Warner Bros. Discovery axing an entire Batgirl movie so that it could save a few pennies and reboot its flailing DC movie universe is not an indication of a superhero-movie slump, I’m not sure what is (and Marvel’s not doing much better). The good news for fans of the prismatic fantastical cinematic possibilities that comic book adaptations offer: There’s been a wild Batwoman movie around to watch for 55 years and there’s a high-percent chance you’ve never seen it, let alone heard of it. Thanks to the curation-forward streaming service Mubi, that ends today.