"Voyager's Return" is the sixth episode of the first series of Space: 1999, with a screenplay written by Johnny Byrne from an idea by Joe Gannon,[1] and was first screened on 9 October 1975 in the UK,[2] and 21 November 1975 in the United States.

[3] The episode is based on the Moon encountering a spaceship from Earth, Voyager One, the dangerous power source of which could have fatal consequences.

Its high speed is due to its power plant, the Queller Drive, an atomic engine that generates fast neutrons which are inimical to many life forms.

While it is decided that Voyager must be destroyed, Prof. Bergman argues that there must be a better way to save the huge amount of data that the ship has gathered in its travels.

As Alphans explore Voyager, an image of an alien appears - he introduces himself as Aarchon, the "Chief Justifier of the Worlds of Sidon".

He created the character of Ernst Queller, inspired by "father of the hydrogen bomb" Edward Teller and Wernher von Braun, saying "I saw him like one of these haunted Germans who has done things during the war and felt ashamed of them later and tried to atone in some way."