Mongal
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Mongal is the sister of Mongul Jr., introduced by her brother to Superman in Superman #170. When Krypto nearly killed Mongul, Mongal escaped and reappeared to destroy New York city. After Maxima's death in Our Worlds at War, Mongal was chosen as the ruler of her homeworld of Almerac, and was established as a galactic threat to Superman.
After a squabble with her brother in Green Lantern volume 4 #8, Mongul Jr. punched off her head, stating family to be a weakness.