1 January 1977
David Garfield (Neeva), Victor Lucas (Andor) [1-2], Brendan Price (Tomas), Leslie Schofield (Calib), Colin Thomas (Sole) , Lloyd McGuire (Lugo) , Tom Kelly , Brett Forrest  (Guards), Rob Edwards [2-3], Pamela Salem , Anthony Frieze , Roy Herrick  (Xoanon)*, Leon Eagles (Jabel) [3-4], Mike Elles (Gentek) [3-4], Peter Baldock (Acolyte) .
|Written by||Chris Boucher|
|Directed by||Pennant Roberts|
|Produced by||Philip Hinchcliffe|
The TARDIS lands on a planet The Doctor doesn’t recognise – but its inhabitants seem to know him. They think he’s the Evil One and aren’t pleased to see him. Two warring tribes occupy the planet: the savage Sevateem and the reclusive Tesh, separated from each other by a deadly energy field. When the Sevateem believe their God, Xoanon, to be a captive of the Tesh, they decide to break through the barrier and rescue him. The Tesh, however, have other ideas.
Befriended by Leela, a Sevateem girl who dares to question the mighty Xoanon, The Doctor sets out to discover exactly what’s happening on this planet. Has he been here before? Is he responsible for the tribal wars? And can it possibly be that Xoanon, the mad God, is really The Doctor?
Anthony Frieze, credits as one of the voices of Xoanon, was the young winner of a competition to visit The Doctor Who studios. Philip Hinchcliffe arranged for a recording of his voice to be made shouting ‘Who am I?’ for the climax to Part Three.