DAXAM and CADMUS

After the death of Lex Luther his Mother runs a Union Called Cadmus as she prepares to attack and destroy all the aliens including Kara, Clark and John. Recently the real Hank Shaw is a live and he called himself as cyborgsuperman.

Hank  Shaw Returns as Cyborg Superman

In the beginning of season 2 a new kryptonian spaceship arrived on earth but it was a guy from daxam planet and his name is mon el , Kara took  care of him and she trained him to joined D.E.O and finally she became his girlfriend.

Mon-El's Parents explains how they are to supergirl

Mon-el thought that he is the only person who survived on  Daxam until his parent arrived and they Revealed his secret as his father is the king of daxam and his mother is the queen which it makes Mon-El the prince of daxam, but he refused to return and he decided to stay on earth but on the Episode 17^th promo it seems that D.E.O will face a new enemy .