Directed by
| Gerry Anderson | ||
| Cyril Frankel | ... | (as Frankel) |
| Jeremy Summers | ... | (as Summers) |
| David Tomblin | ... | (as Tomblin) |
Writing Credits (in alphabetical order)
| Gerry Anderson | ... | (creator) |
| David Tomblin | ||
Cast (in credits order)
| Ed Bishop | ... | Cmdr. Ed Straker | |
| Michael Billington | ... | Col. Paul Foster | |
| Gabrielle Drake | ... | Gay Ellis | |
| Wanda Ventham | ... | Col. Virginia Lake | |
| Derren Nesbitt | ... | Craig Collins | |
| Vladek Sheybal | ... | Dr. Doug Jackson | |
| Rest of cast listed alphabetically: | |||
| Andrea Allan | |||
| Patrick Allen | ... | Turner | |
| Deborah Grant | ... | Linda Simmonds | |
| Alexis Kanner | |||
| Mike Pratt | |||
| George Sewell | ... | Col. Alec Freeman | |
 |
Maureen Tann | ||
| Shane Rimmer | ... | Lt. Bill Johnson / Alien / CIA Agent (uncredited) | |
Produced by
| Gerry Anderson | ... | executive producer / producer |
| Reg Hill | ... | producer |
Special Effects by
| Derek Meddings | ... | special effects coordinator |
Additional Crew
| David Hirsch | ... | Creative Consultant |
| Robert Mandell | ... | creative production co-ordinator |
