Gunnar the Conqueror is a character seen in Loonatics Unleashed.
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. They attempted to freeze the world so it would be easier to conquer, starting with Acmetropolis' planetary power generator. Gunnar was deactivated along with his other minions when Ace kicked him at the planetary power core, restarting all power in the city.
- He is voiced by Tom Kenny.