Voltron: The Third Dimension

Season 1, Episode 12

Episode Title: Dark Heart

Air Date: 1999-02-20

Overview:

Haggar seeks to avenge the break up of her relationship with King Alfor. She imprisons Alfor's spirit in a Crystal Robeast, which soon does battle with the Voltron Force. But if they destroy the robeast, they will also destroy Alfor's spirit.