Wikipedia
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 has appeared over the years in Legion of Super-Heroes related comic books.
The original Dev-Em was a Kryptonian juvenile delinquent that attacked Superboy, after being thwarted by Superboy, Dev-Em traveled to the 30th century where he became an occasional ally of the Legion. Once DC Comics re-wrote their history with Crisis on Infinite Earths Dev-Em was changed into a Daxamite instead of a Kryptonian. Post- Infinite Crisis, he was once again made a Kryptonian; a criminal sentenced to the Phantom Zone.
A character called Dev-Em, played by Revard Dufresne, appeared in the 2013 Man of Steel movie where he was portrayed as a Kryptonian villain similar to the original comic book character.