Set in ancient Mexico, this lavish 1970s children’s series about a young boy’s battle against evil stars Doctor Who\'s Patrick Troughton as a bloodthirsty priest with Diane Keen as a Toltec princess. All 12 episodes of the lavish 1970s children’s series set in ancient Mexico, starring Patrick ‘Doctor Who’ Troughton as a bloodthirsty Toltec priest who demands human sacrifices to satisfy his god. Only by marrying Emperor’s daughter Chimalma (Diane Keen) can Prince Heumac ensure the return of the peaceful god Quala – the Feathered Serpent – so he sends servant boy Tozo to ask for her hand. Soon, though, Tozo is embroiled in a terrible battle between good and evil.