Kara/Supergirl is hope and goodness personified, driven to save people by little more than the stubborn belief that they’re worth saving. According to the always image-conscious Cat, this means that Supergirl must be perfect and, by extension, can’t be human, but Kara’s humanity, so to speak, is ultimately what makes her a hero. Where her big-screen counterparts are defined and limited by their powers, Kara is defined—and freed—by her restraint. As exemplified by her encounter with a would-be robber in the episode “Human for a Day,” she doesn’t need to resort to violence or even to use her super-strength, freeze breath, or any of her other exceptional abilities to save the day. She proves herself not by winning battles and defeating enemies, but by helping people.