A strange signal from Earth draws the TARDIS to the island of Lanzarote, where Turlough rescues a young American girl, Peri, from drowning. Among her possessions is an artefact bearing an alien symbol - the same triangular mark that Turlough has branded into his arm. The mystery deepens when Kamelion falls under the control of a powerful mind, and the TARDIS travels to the volcanic world of Sarn. As Turlough is forced to face his past, the Fifth Doctor must stop his oldest enemy from harnessing the revitalising powers of Numismaton gas...
as The Doctor
as Turlough
as Peri Brown
as The Master
as Timanov
as Amyand
as Professor Howard Foster
as Roskal
as Malkon
as Sorasta
as Curt
as Father
as Young Malkon
as Pilot
as Captain Lomand
as Zuko
as Lookout
