Gsptlsnz or sometimes known as Gizbie is the attractive girlfriend of Mr. Mxyzptlk. Unlike her hyperactive, wild and crazy partner she is more laid back and indifferent to mortals. As an Imp from the fifth dimension she shares the same powers as Mr. Mxyzptlk and isn't bound by third dimensional laws.
In Superman: The Animated Series she was first voiced by Sandra Bernhard for the episode "Mxyzpixilated". For the episode "Little Big Head Man" she was voiced by Jennifer Hale.