Voltron: The Third Dimension

Years ago, the Voltron Force ultimately defeated Prince Lotor, resulting in his horrible disfigurement and Voltron being retired. But before Lotor was captured, he sent Castle Doom away to an unknown location. Now in the present, Keith, Allura, Amalgamus and a supposedly reformed King Zarkon are trying to learn from Lotor where Castle Doom went. Meanwhile, space pirates have reemerged and begun attacking Alliance ships and colonies.

Lance strike out on his own in Red Lion to hunt down the escaped Lotor. Space pirates, Queequeg and Lafitte, lead him into a trap set up by Lotor. Against orders, the rest of the Voltron Force take their Lions to rescue him.

Lotor holds a phony peace summit with Zarkon and Keith, with Lance secretly coming along. Lotor uses a crystal Haggar gave him to enter the Dream Dimension. Lance pursues and finds Haggar has been looking after Castle Doom all this time.

Amalgamus suspends the Voltron Force and replaces them with robot pilots. The robots first test is to protect Outpost Opal from Lotor, but it becomes clear only the original pilots can achieve victory.

The Voltron Force are given a false order to attack Planet Geo and are forced to repair the damage they did to a mining colony, where they encounter some mutated space lice. It's all part of Lotor's scheme to attack the Castle of Lions.

Haggar casts a spell on Hunk, turning him against the rest of the Voltron Force. The spell also turns Yellow Lion into a destructive Gray Lion. The rest of the team have to find a way to save Hunk and rescue Amalgamus from Lotor.