* Charlotte Kirk as Sergeant Kate "Kat" Riddle
* Jonathan Rhys Meyers as Roy "The Boss" Benning
* Mark Griffin as James
* Giles Foreman as Harris
* Laurie Calvert as Dr. Eva Davies
* John Standing as Commander Stewart
* Theo Barklem-Biggs as Lieutenant Daniel "Danny" Harris
* David Hayman as Dr. Mark Davies
This is the main cast. There are also supporting roles played by other actors.