She appeared in the episode Rokan: Enemy from Space. Rokan was a pterodactyl-like monster from Krypton. When she arrived on Earth she easily overpowered the SuperFriends, then began laying clutches of eggs that hatched into baby roghkans. Eventually Rokan and her brood were driven off Earth with massive hunks of Kryptonite.
Rokan exhibited Kryptonian powers similar to Superman's, but at much higher magnitudes. The ones most evident were her strength, invulnerability, survival in space without an air supply and heat vision able to cut through Wonder Woman's Magic lasso.