Few people know of the chilling reality behind the mysterious phenomenon of unidentified flying objects. Beings from a dying planet have arrived on Earth to kidnap humans and take over their vital organs. Against this threat, SHADO has been created, a secret organisation equipped with the most advanced technology and the best men.
| Actor | Role |
|---|---|
 Ed BishopCommander Ed Straker | Commander Ed Straker |
 Wanda VenthamColonel Virginia Lake | Colonel Virginia Lake |
 Dolores MantezNina Barry | Nina Barry |
 Gabrielle DrakeTeniente Ellis | Teniente Ellis |
 Michael BillingtonColonel Paul Foster | Colonel Paul Foster |
 David CollingsDaniel Clark | Daniel Clark |
 Colin GordonAlbert Thompson | Albert Thompson |
 Deborah GrantLinda Simmonds | Linda Simmonds |
 Vladek SheybalDr. Doug Jackson | Dr. Doug Jackson |