Reparto

• George Peppard — John Shay
• Joan Collins — Sarah Booth
• Judy Geeson — Polly Bendel
• Oskar Homolka — Racovsky
• Charles Gray — Vaughan Jones
• Nigel Patrick — Colonel Scott
• Keith Michell — Adam Booth
• George Baker — Philip Crawford
• Alexander Scourby — Prof. Parker
• Peter Bull — Butterfield
• Ernest Clark — Roper
• Peter Dyneley — Balkov
• Γκιζέλα Ντάλι — Anna
• Stefan Gryff — Shay Cell Group Surrvior
• Steve Plytas — Poilce Inspector

Guion

• Jack Pulman — writer
• Gordon McDonell — story

Producción

• Charles H. Schneer — producer
• Peter Price — production manager
• Miriam Brickman — casting
• John Comfort — production manager

Sonido

• Ron Goodwin — original music composer

Montaje

• Roy Watts — editor

Vestuario y maquillaje

• Yvonne Caffin — costume design
• Trevor Crole-Rees — makeup artist

Cámara

• Denys N. Coop — director of photography
• Alan Hall — camera operator

Arte

• Edward Marshall — art direction

Dirección

• Sam Wanamaker — director