Screenplay by DENNIS SPOONER   Directed by CYRIL FRANKEL     Three agents of an international security organisation are granted miraculous powers of physique and mental ability when rescued after an air crash in Tibet. They become super humans.     Craig Stirling (STUART DAMON) and Richard Barrett (WILLIAM GAUNT), both agents of the international security organisation known by the code name of Nemesis, and Sharron Macready (ALEXANDRA BASTEDO), a trained bacteriologist with the organisation, are detected after raiding a secret germ warfare establishment. They get away with a test tube containing the incriminating germs, but their ’plane is so badly damaged that they crash in the desolate mountain regions of Tibet. All three are seriously injured: death seems inevitable.   Back at Nemesis, the organisation’s head, Tremayne (ANTHONY NICHOLLS), waits for news and tries to pacify two impatient Military Attaches (KENNETH J. WARREN and JOSEPH FURST), who are convinced that the three operators must be dead. Tremayne urges them to wait a little longer…   The three agents return to consciousness to find themselves miraculously unhurt. Their wounds are healed, but marked with gold scars. Only Craig has a vague, dream-like recollection of being operated on by a very old man. He and Sharron decide to trek towards India, but Richard says he must find their unknown rescuers, his decision strengthened by Sharron’s belief that she saw some kind of city below them just before they crashed.   They set off in opposite directions, and Richard finds the secret city and meets its aged but ageless Elder (FELIX AYLMER) who admits to having cured them, and also tells him that he and his companions have now been endowed with super-human qualities. Although they are still human and not immortal, they are champions in every field of endeavour, with sharpened mental capacities. Only experience will teach them how to use these improved bodies and minds. But, in return, they must not reveal the existence of the secret city.   One of their new powers is a telepathic understanding. They can hear each other over long distances. They will also be aware when the others are in danger. And at that very moment, Craig and Sharron are in danger: they have been captured by the pursuing Chinese.   Richard follows them and finds Craig, who has been shot and left for dead. Miraculously, he has again survived. The two men now have to rescue Sharron. Their new powers are put to their first test…     AN PRODUCTION   Series created by Monty Berman and Dennis Spooner   © Copyright Incorporated Television Co. Ltd. MCMLXVII     Stuart Damon   Alexandra Bastedo   William Gaunt   Anthony Nicholls     Craig Stirling   Sharron Macready   Richard Barrett   Tremayne     Felix Aylmer   Kenneth J. Warren   Joseph Furst   Eric Young   Burt Kwouk     The Old Man   Whittaker   Chislenkan   Ho Ling   Chinese Major     Associate Producer   Director of photography   Art director   Editor     Johnny Goodman   Frank Watts   Charles Bishop   Peter Pitt     Musical director   Theme composed by   Post-production supervisor   Production manager   Casting     Robert Farnon   Tony Hatch   Philip Aizlewood   Malcolm Chistopher   Judith Jourd     Sound editor   Sound recordists     Music editor   Associate art director   Set dresser   Construction manager     William Trent   Len Abbott, Dave Bowen   Deveril Goodman   John Graysmark   John Jarvis   Bill Greene     Second unit director   Second unit cameraman   Camera operator   Assistant director   Continuity   Special effects photography     John Hough   James Allen   John Winbolt   Pat Kelly   Valery Norman   John Mackey     Scenic artist   Production buyer   Make-up supervisor   Hairdressing   Wardrobe supervisor   Supervising electrician     A.J. Van Montagu   Sid Palmer   Gerry Fletcher   Pat Grant   Laura Nightingale   Ted Hallows       Made on location and at ASSOCIATED BRITISH ELSTREE STUDIOS ENGLAND.