M'gann M'orzz (Earth-51022015)

M'gann is one of the last three martians in existance, alongside her uncles J'onn and Ma'alefa'ak. Due to Ma' having caused the genocide of their people, M'gann was taken as an infant by her uncle J'onn to Earth, where they lived with Jonathan Kent and Martha Kent. 40 years later, the ever youthful M'gann eventually debuted as her uncles sidekick: The Supergirl.