Gunnar the Conqueror

Description
Gunnar was the leader of a band of robotic Vikings whose weapons used freezing blasts. They were frozen in an iceberg in their own dimension but were released by the meteor that struck Acmetropolis and attempted to freeze the world so it's easier to takeover, starting with Acmetropolis' planetary power generator. He was deactivated as well as his other minions when Ace kicked him at the planetary power core, restarting all power in the city.

Trivia
He is voiced by Tom Kenny.