Mister Mxyzptlk comes to Supergirl on the CW

Who is Mxyzptlk?

Mister Mxyzptlk is an impish character who appears in Superman comic books. He is a sorcerer from the fifth dimensions who has a penchant for playing pranks on Superman.

His first appearance was in Superman #30 (Sept. 1944) in the story “The Mysterious Mr. Mxyztplk”. He is portrayed as a small bald