This episode introduces Moonbase Alpha's resident alien Maya, who has the power to transform herself into any creature at will. Koenig: Martin Landau. Dr. Russell: Barbara Bain. Tony Verdeschi: Tony Anholt. Mentor: Brian Blessed.
The Alphans come upon a fleet of missile-like objects that imprison the bodies of exiles from another planet. John: Martin Landau. Cantar: Peter Duncan. Helena: Barbara Bain. Zova: Stacy Dorning. Maya: Catherine Schell. Mirella: Margaret Inglis. Tony: Tony Anholt. Alan: Nick Tate.
New equipment enabling John, Helena and Alan to return goes awry and the three land in plague-ravaged 14th-century Scotland. John: Martin Landau. Dr. Logan: Freddie Jones. Helena: Barbara Bain. Carla: Isla Blair. Alan: Nick Tate. MacDonald: Roger Bizley. Jackson: Laurence Harrington. Maya: Catherine Schell. Tony: Tony Anholt.
Helena and Tony are teachers on a planet of robots eager to learn about emotions and eventually become human. Helena: Barbara Bain. Zamara: Billie Whitelaw. Tony: Tony Anholt. Zarl: Leigh Lawson. John: Martin Landau. Maya: Catherine Schell. Number Eight: Geoffrey Bayldon. Alan Carter: Nick Tate. Sandra: Zienia Merton. Dr. Mathias: Anton Phillips.
Kidnap victims, Koenig and Russell find themselves at the mercy of a robot on a planet with a poisonous atmosphere. Maya: Catherine Schell. Captain Michael: Bernard Cribbins. Tony Verdeschi: Tony Anholt. Bill Fraser: John Hug.
Magus, an alien claiming to be the "creator," offers the Alphans a present they can't refuse: a new earth. Cdr. John Koenig: Martin Landau. Dr. Russell: Barbara Bain. Maya: Catherine Schell. Tony Verdeschi: Tony Anholt. Alan Carter: Nick Tate.
Two aliens discovered in a chamber beneath the moon's surface suffer from a disease that causes violence. Barbara Bain, Martin Landau. Pasc: John Standing. Maya: Catherine Schell. Etrec: Michael Gallagher. Tony Verdeschi: Tony Anholt. Alan Carter: Nick Tate. Andy Johnson: John Alkin.
Because of Maya's accidental "murder" of some flowers on a planet, she and John must engage in mortal combat with three aliens who committed a similar "crime." Maya: Catherine Schell. Aliens: David Jackson, Godfrey James, Roy Marsden. John: Martin Landau. Helena: Barbara Bain.
The Alphans land on a planet where living rocks emit deadly rays of light. Cdr. John Koenig: Martin Landau. Dave Reilly: Patrick Mower. Dr. Russell: Barbara Bain. Maya: Catherine Schell. Tony Verdeschi: Tony Anholt. Carter: Nick Tate.
A traveling trader of the universe covets Maya in return for a device that could transport the Alphans back to earth. Taybor: Willoughby Goddard. Cdr. John Koenig: Martin Landau. Dr. Helena Russell: Barbara Bain. Tony Verdeschi: Tony Anholt. Alan Carter: Nick Tate. Bill Fraser: John Hug.
On an asteroid, Cdr. John Koenig collapses inside a cave whose crystallike walls reflect myriad images of himself, one of which returns in his stead to Alpha. Dr. Russell: Barbara Bain. Maya: Catherine Schell. Tony Verdeschi: Tony Anholt. Alan Carter: Nick Tate. Sandra: Zienia Merton. Dr. Ben Vincent: Jeffrey Kissoon.
Maya, Alan and John head for a planet from which shock waves have been emanating. Martin Landau, Barbara Bain. A: Ina Skriver. B: Sarah Douglas. Maya: Catherine Schell. Alan Carter: Nick Tate.
Blasted from a tunnel by an explosion, miner Patrick Osgood has a surrealistic vision of the destruction of Alpha. Cdr. John Koenig: Martin Landau. Dr. Helena Russell: Barbara Bain. Maya: Catherine Schell. Michelle Osgood: Pamela Stephenson. Tony Verdeschi: Tony Anholt. Dr. Ben Vincent: Jeffrey Kissoon. Sandra: Zienia Merton.
Her powers distorted by a disease, Maya uncontrollably turns into one creature after another. Martin Landau, Barbara Bain. Tony Verdeschi: Tony Anholt. Alan Carter: Nick Tate.
An alien whose people are moving back in time plans to save them by exchanging them with Alphans through a "time portal." Martin Landau, Barbara Bain. Shermeen: Lynne Frederick. Maya: Catherine Schell. Vindrus: Stuart Wilson. Tony Verdeschi: Tony Anholt. Alan Carter: Nick Tate. Bill Fraser: John Hug.
Many Alphans are already incapacitated when they are menaced by a creature dispatched by a planet to steal their life-support system. Cdr. John Koenig: Martin Landau. Dr. Helena Russell: Barbara Bain. Maya: Catherine Schell. Tony Verdeschi: Tony Anholt. Alan Carter: Nick Tate. Sandra: Zienia Merton. Fraser: John Hug.
The appearance of a cloud coincides with the death of a young woman and nightmares experienced by Koenig. Barbara Bain. Carolyn Powell: Deborah Fallander. Maya: Catherine Schell. Mark Sanders: Jess Conrad. Tony Verdeschi: Tony Anholt.
An experimental machine enables Koenig to perceive apparent rescuers as hostile aliens. First of two parts. Barbara Bain. Guido Verdeschi: Stuart Damon. Maya: Catherine Schell. Dr. Shaw: Patrick Westwood. Tony Verdeschi: Tony Anholt. Alan Carter: Nick Tate.
Conclusion of a two-part story. Maya infiltrates the ranks of alien warriors disguised as rescuers. Martin Landau, Barbara Bain. Guido Verdeschi: Stuart Damon. Tony Verdeschi: Tony Anholt. Dr. Shaw: Patrick Westwood. Alan Carter: Nick Tate. Sandra Benes: Zienia Merton.
With Alpha and a huge planet headed for collision, Koenig's handling of the crisis is challenged by dissident Alphans. Martin Landau, Barbara Bain. Sanderson: Ken Hutchinson. Maya: Catherine Schell. Eva: Carolyn Seymour. Tony Verdeschi: Tony Anholt. Alan Carter: Nick Tate. Sandra Benes: Zienia Merton.
A survivor from Maya's planet Psychon arrives as the exiled prisoner of an alien woman. Martin Landau, Barbara Bain. Dorzak: Lee Montague. Maya: Catherine Schell. Sahala: Jill Townsend. Tony Verdeschi: Tony Anholt. Alan Carter: Nick Tate.
On a planet's penal-colony moon, Koenig is captured by cat-women. Barbara Bain. Elizia: Hildegard Neil. Maya: Catherine Schell. Tony Verdeschi: Tony Anholt. Bill Fraser: John Hug.
The disintegration of their spacecraft traps John, Alan and a critically injured Tony on a planet. Martin Landau, Barbara Bain. Maya: Catherine Schell. Alan: Nick Tate.
Dorcons threaten to invade Alpha unless Maya is handed over to them for use in their experiments. Martin Landau, Barbara Bain. Varda: Ann Firbank. Tony: Tony Anholt. Alan: Nick Tate. Sandra: Zienia Merton.