The Negative Creature

The Negative Creature

A giant space-faring bird-like creature "composed entirely of negative ions."

Supergirl is summoned to the 30th Century by the Legion of Super-Heroes in an April 1962 chronicle to battle the Positive Man, a creature that she describes as "a destructive force which was once ... human! That mind-tape revealed he was once an alien scientist who blew up his planet while creating a Doomsday bomb! The explosion transformed him into this terrible menace! Envious of all life, he roams the cosmos, jealously destroying inhabited worlds!" Unable to handle the Positive Man using just her Kryptonian powers, Supergirl lures the Negative Creature, a product of the same doomsday explosion, into the vicinity of the Positive Man, ensuring that both creatures disappear, essentially cancelling each other out. (Act No. 287: "Supergirl's Greatest Challenge")