Mark Bonnar (Commander John Koenig)
Maria Teresa Creasey (Dr Helena Russell)
Timothy Bentinck (Commissioner Simmons)
Clive Hayward (Professor Victor Bergman)
Susan Hingley (Sandra Benes / Sian Springer / Alpha Computer)
Glen McCready (Commander Gorsky / Paul Morrow / Alan Carter)
Amaka Okafor (Dashka Kano)
Jules de Jongh (Petra Nordstorm)