He first appeared in Action Comics #261 (February 1960) and was created by Jerry Siegel and Jim Mooney.

[1] He is Supergirl's pet cat who gained superpowers through exposure to X-Kryptonite; such as flight, super-strength, super-speed, invulnerability, and enhanced vision abilities, among other Kryptonian powers.

Streaky the Supercat first appeared in Action Comics #261 (February 1960) and was created by writer Jerry Siegel and artist Jim Mooney.

[2] Streaky is Supergirl's pet cat who gains superpowers from a variety of kryptonite she created while attempting to neutralize its effects.

[3][4][5] Streaky made sporadic appearances in comics through the 1960s and joined the Legion of Super-Pets, a group consisting of the aforementioned super-powered animals.