Dev-Em is a fictional character who appears in DC Comics. He first appeared in Adventure Comics #287 (June 1961), created by Jerry Siegel and George Papp. Various versions of the Dev-Em character have appeared over the years in Legion of Super-Heroes related comic books.

Dev-Em was a juvenile delinquent on the planet Krypton who became imprisoned in the Phantom Zone. Eventually he escaped during the 30th Century, where he turned over and became a teenage super-hero. He has been a member of the Interstellar Counter-Intelligence Corps and the Legion of Super-Heroes.

Dev-Em was a "wayward youth" who also escaped Krypton's destruction. When Jor-El warned the populace about the planet's imminent doom, Dev-Em took those words to heart and placed himself and his parents in suspended animation in an orbiting space capsule.

Dev-Em tracks down Krypton's only other survivor, Jor-El's son SuperBoy. He battles and imprisons Superboy in the Phantom Zone, quickly assuming his identity in an effort to...

Dev-Em is a fictional character who appears in DC Comics. He was imprisoned in the Phantom Zone for his crimes. He was later released and battled the Legion of Super-Heroes.

Dev-Em stands before the Council of Five in the Legislation Chamber, awaiting his punishment. Five weeks after the murder of Kell-Ur, Dev-Em was put on trial in front of the Kryptonian Law Council for Krypton's first murder in centuries.

Dev-Em is a Kryptonian war criminal and member of the Sword of Rao, as well as one of the first great enemies of the hero, Superman. Together with Dru-Zod, Dev-Em II attempted to re-establish Krypton on Earth by bringing about a terraformation apocalypse (in …

Dev-Em was a Kryptonian criminal sent to the Phantom Zone. On Krypton, Dev-Em was a criminal who was arrested for murder and perversion. He was taken to Fort Rozz for trial, where he was to be...

Dev-Em was a maniacal Kryptonian, the planet's first murderer in over a century. Kryptonian Physiology: Under the effects of a "yellow" sun, Dev-Em possesses the same potential powers as an average Kryptonian.

Dev-Em is a loyal Sagitari commander and Lyta-Zod’s intended. He comes from a traditional house, but only goes through the motions of Raoism. His heart lies with Lyta and his loyalty lies with his Primus, Jayna-Zod. Dev-Em’s family was killed in an attack by Black Zero.