Volume 1, #393. "Supergirl: The Unwanted Supergirl!"
DC Comics. May, 1970.
Writer(s): Robert Kanigher
Artist(s): Win Mortimer, Jack Abel
Notes:
Appearance: Mr. Mxyzptlk
Backup story "The Girl Who Knew Supergirl's Secrets!" by E. Nelson Bridwell, Kurt Schaffenberger
Cover Art: Curt Swan, Murphy Anderson