A fateful landing on Earth in the 26th Century finds the TARDIS deep within a system of subterranean caves and even deeper within the mystery surrounding the brutal murder of a group of geologists working there. Who is controlling the androids guarding the hatch in the rock face? More importantly, what lies beyond it? The answers provide a serious threat for the Doctor as the time and place is set for an encounter with his old arch enemies. The Cybermen are well and truly back and the Doctor and his companions could well be counting the cost in truly personal terms. Cast Suzi Arden : Snyder David Banks : Cyber Leader June Bland : Berger Anne Clements : First Trooper Clare Clifford : Kyle Peter Davison : The Doctor Janet Fielding : Tegan Mark Fletcher : First Crew Member Mark Hardy : Cyber Lieutenant Ann Holloway : Mitchell Steve Morley : Walters Beryl Reid : Briggs Alec Sabin : Ringway Mark Straker : Second Trooper Sarah Sutton : Nyssa James Warwick : Scott Matthew Waterhouse : Adric Christopher Whittingham : Second Crew Member