Think you know your Supergirl characters? What about Lesla‑Lar? This silver age character was created by Jerry Siegel & Jim Mooney. She made her first appearance in Action Comics #279 from 1961. Lesla‑Lar is a Kryptonian scientist from the bottled city of Kandor who becomes deeply jealous of Supergirl’s potential fame and freedom. She invents a device to strip Supergirl of her powers — then swaps places with her and impersonates her on Earth. It’s one of the earliest and most “soap‑opera style” identity‑swap arcs in Supergirl lore. She’s one of the very first original Supergirl villains. Her “final appearance in pre‑Crisis continuity” was in The Superman Family #206 (1981), where she — or rather her disembodied intelligence — attempted to possess Supergirl, culminating in a final “astral‐plane” battle. The CW show 'Superman & Lois' does include a character named Leslie Larr, played by actress Stacey Farber, however she was never confirmed to be anything more than human. I wonder if we'll see her in James Gunn's Supergirl or in the teaser trailer set to be released soon.