Reparto

• Martin Landau — Commander John Koenig
• Barbara Bain — Doctor Helena Russell
• Barry Morse — Professor Victor Bergman
• Nick Tate — Captain Alan Carter
• Prentis Hancock — Paul Morrow
• Zienia Merton — Sandra Benes
• Roy Dotrice — Commissioner Gerald Simmons
• Anthony Valentine — Male Alien
• Isla Blair — Female Alien
• Philip Madoc — Commander Anton Gorski
• Lon Satton — Benjamin Ouma
• Eric Carte — Eddie Collins
• Clifton Jones — David Kano
• Patrick Allen — Luna Commission Chairman
• Christopher Matthews — Main Mission Operator

Dirección

• Lee H. Katzin — director
• Charles Crichton — director

Producción

• Sylvia Anderson — producer
• Gerry Anderson — executive producer
• Ron Fry — production manager

Guion

• Christopher Penfold — screenplay
• George Bellak — screenplay

Equipo técnico

• Brian Johnson — special effects
• David Hirsch — creative consultant

Montaje

• David Lane — supervising editor