RHEA: Queen of Daxam, the sister planet to Krypton, is the mother of Mon-El. After Krypton's destruction, the King and Queen of Daxam set out to find their son, Mon-El, who was sent in a Kryptonian pod to Earth. They didn't know which planet Mon-El escaped to but through luck and the events on Slaver's moon, the pair was able locate Mon-El. Their exact motives are unknown but as Queen, Rhea commands a vast Daxam battle ship as well as many soldiers with powers lesser but similar to Kryptonians under a yellow sun.

For more on Rhea, check out our partners at ArrowverseWiki.