Commander John Koenig

Date of birth: 17 March 1957
Commander of Moonbase Alpha. His wife, Jean, was killed in 1987.

Doctor Helena Russell

Date of birth: 5 August 1960
A specialist in space medicine. Her husband, Lee, disappeared in Jupiter's orbit.

Professor Victor Bergman

Date of birth: 27 June 1940
A civilian scientist who acts as an advisor to Commander Koenig. He has an artificial heart that slows his physiological response to stress.

Alan Carter

Date of birth: 19 December 1966
Reconnaissance pilot who witnessed the nuclear explosion that tore the moon from Earth's orbit. He had the chance to return to Earth, but chose to remain on Moonbase Alpha.

Paul Morrow

Date of birth: 29 October 1970
Second in Command of Moonbase Alpha.


A shapeshifter rescued from the destruction of her homeworld by the Alphans. She becomes the science officer on the base.

Tony Verdeschi

Date of birth: 9 November 1966
Chief of Security on Moonbase Alpha.