Doomsday savagely murdered Kem, played by Rasmus Hardiker, while attempting to save Seg-El (Cameron Cuffe). Kem is the second main character to die in season 2, after Daron-Vex (Elliot Cowan), who was slain by Lyta-Zod in the season premiere (Georgina Campbell). Kem was a young Kryptonian male born on Kandor. His parents were killed when he was very young, and he was raised by members of his people until they were able to move away from their homeland. He learned how to use his superpowers at a young age and became a member of the Legion of Super-Heroes. After arriving on Earth, Kem met Clark Kent (Tyler Hoechlin) who was looking for someone to help him fight against Doomsday. They soon become friends, and Kem helps Clark learn about his powers and fights alongside him against other meta-humans. After defeating Doomsday, Kem decides to stay on Earth with Clark. However, he is then killed by Doomsday's father, KGBeast (Peter Shinkoda). Kem is later resurrected by Vandal Savage (John DiMaggio) who uses his body to create an army of doomsday mutants. This new legion of Doomsters battles Superman and other heroes throughout America, but they are eventually defeated by them. Later on, it is revealed that Savage has been using Kem's body to carry out his plans from beyond the grave.