7.0/101 votes#1 - Dorzak
Season 2 Episode 21 - Aired 8/25/1977
A spaceship arrives on Moonbase Alpha carrying a prisoner, whom Maya is astonished to learn is Dorzak, a survivor from her planet, Psychon. But can he, a man of peace, really be guilty of the crimes of violence for which he is being exiled?
Director: Val Guest
Writer: Christopher Penfold
6.5/102 votes#2 - Guardian of Piri
Season 1 Episode 11 - Aired 11/13/1975
Strange events befuddle the Alphans as they approach the planet Piri. When exploring its lifeless surface, Koenig encounters the seductive servant of the mysterious Guardian of Piri. She offers the wayward Alphans a life of peace and perfection. Realising the deadly truth behind the peace of Piri, Koenig struggles to free his people from the Guardian's influence.
Director: Charles Crichton
Writer: Christopher Penfold
6.0/101 votes#3 - Space Brain
Season 1 Episode 21 - Aired 1/29/1976
An Eagle and its crew are crushed to death by an enormous energy field in space. When one of Alpha's astronauts is possessed by the anomaly, he tells them the energy field is a living space brain, which responded to the 'threat' with antibodies Finding the Moon on a collision course with the Brain, the Alphans make plans to avoid the same fate as the Eagle.
Director: Charles Crichton
Writer: Christopher Penfold
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Christopher Penfold Ratings Summary
"Dorzak" is the best rated episode written by Christopher Penfold. It scored 7/10 based on 1 votes. It was directed by Val Guest. It aired on 8/25/1977 and is rated 0.5 points higher than their second-best episode, "Guardian of Piri".