Regular Cast: Nicholas Young as John, Elizabeth Adare as Liz, Peter Vaughan-Clarke as Stephen, Philip Gilbert as TIM, Dean Lawrence as Tyso.

Also Starring: Brian Stanion as Professor Cawston, Ann Curthoys as Patricia Conway, Trevor Bannister as Colonel Masters, Hugh Morton as Prime Minister, Denise Cook as Evergreen Boswell, Joanna Tope as Mrs. Boswell, Frank Gatliff as Father O'Connor.

Also Starring: Philip Gilbert as Timus/Tikno, Joanna Tope as Mrs. Boswell, Denise Cook as Evergreen Boswell, Lydia Lisle as Lenda, Barry Lineham as Veshtaker, Reg Lye as Vanyon, Keith Chegwin as Arkron.

Also Starring: Peter Davison as Elmer, Sandra Dickenson as Emily, Margaret Burton as The Momma, Robin Parkinson as Publica, Bill Dean as Mr. Greenhead.

Also Starring: Philip Gilbert as Timus/Tikno, Brian Stanion as Professor Cawston, Ann Curthoys as Patricia Conway, Francis de Wolff as Jedikiah, John Lyon as Sergeant Evans, Denise Cook as Evergreen Boswell, Ali Bongo as Mustaf, Anne Ridler as Professor Johnston.