Ragnarok

Ragnarok is a character introduced in the Alien Force episode Vendetta. He is notable for being the one who murdered Devin Levin, Kevin's father.

Background
According to Max's flashback, Ragnarok was originally a powerful and dangerous alien criminal from unknown origin, who possessed a ship able to drain energy from stars, destroying them in the process.

As he was about to absorb Earth's sun, Devin and Max successfully stole the key for his device. Ragnarok succeeded in catching their ship, and threatened to kill Max if Devin wouldn't tell him where the key was. When Devin declined, Ragnarok attempted to kill Max, but Devin put himself between them, and was fatally wounded instead of Max. Furious, Max used the element of surprise to send Ragnarok into the Null Void, where he was taken in custody.

Powers and Abilities
Ragnarok has enhanced strength as he could beat Kevin in his mutant form. He can teleport himself. He is extremely agile as he could dodge Diamondhead's crystal attacks. He can shoot an extremely powerful energy ray from his hands.