Lesla-Lar is a Kandorian scientist who looks exactly like Supergirl. She becomes jealous of her and constructs a device that saps Supergirl's powers so that she might take her place. Lesla-Lar's diabolical switch is discovered in time by Krypto and she is ultimately sent back to Kandor. She later foolishly allies herself with three Phantom Zone criminals, who turn on her and use a powerful Kryptonian weapon to vaporize her. Even though her body was destroyed, her psychic energy apparently survives. Many years later, she attempts to inhabit Supergirl's mind, but her plan backfires.