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.