The centaur Biron is accidentally transformed into a horse by a grateful Circe (she meant to make him human) and given superpowers to make up for the mistake; confined on an asteroid by an evil magican, he is eventually freed by Kara Zor-El's rocket and follows her to Earth where he eventually unites with Kara, who has grown up to be Supergirl, to fight evil as Comet the superhorse.

B'dg of planet H'lven (who looks like a two foot tall squirrel) is plucked from his planet, chosen to be the Green Lantern in his sector; at the training center he meets Hal Jordan from Earth--and despite a somewhat rocky start, involving an exchange of insults, the two become friends when B'dg saves Hal from the Spider Guild.