Professor Curtis Lark and John Cornelius have established the existence of another colony of mutants in the heart of London, but the only person who could fight them is dead...
Stars Peter Cushing as John Cornelius, Vincent Price as Professor Curtis Lark, Sandra Clarke as Flora Kiery, Frazer Carr as Ian Sanderson, William Eadle as Gulliver, Clifford Norgate as Brigadier Sherman, Clifford Norgate as Brigadier Sherman, James Thomason as Home Office Official and Andrew Sear as Manson.
Written by Rene Basilico from an idea by Robert Holmes.
Producer: John Dyas
First broadcast on BBC Radio 4 in 1977.