Space: 1999 (1975–1977)
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The Infernal Machine 

The Alphans encounter Delmer Plebus Powells Gwent, a huge spacecraft which defies aerodynamics and is an extension of Gwent's genius and ego.


David Tomblin


Anthony Terpiloff (screenplay), Elizabeth Barrows (screenplay) | 2 more credits »




Episode complete credited cast:
Martin Landau ... Commander John Koenig
Barbara Bain ... Dr. Helena Russell
Barry Morse ... Prof. Victor Bergman
Leo McKern ... Companion Gwent
Clifton Jones ... David Kano
Zienia Merton ... Sandra Benes
Nick Tate ... Alan Carter
Gary Waldhorn ... Winters


A visiting bizarrely-constructed alien ship sends out a friendly-sounding voice invites the team of Koenig, Helena, and Victor Bergman to enter the vessel. They have been communicating with the ship itself, which insists that the Alphans send out an eagle full of materials it needs for survival. The sole "human" entity aboard the ship informs the Alphans that he constructed the ship, which calls itself Gwent, and had infused it with his own personality. After the man (called "Companion") dies, the Alphans realize the supplies aren't the only thing that the lonely Gwent has arrived here for.

Plot Summary | Add Synopsis


Did You Know?


Paul Morrow was in the original script for this story but Prentis Hancock had to go into hospital for an operation so his lines were given to a new character Winters. See more »


When Companion lies dead in his glass coffin, he can be seen breathing very obviously. See more »


Lunar Landscape
Composed by Roger Roger (uncredited)
See more »

User Reviews

great acting but a bit to much of conversations
1 September 2014 | by trashgangSee all my reviews

Another episode of Space 1999 that is full of talking and some easy made effects done by colour lighting. But it is also full of explosions and again it's so weird to see so many eagles being destroyed and they still are available again and again. Guess they sure must had a lot of those spacecrafts!

The acting of the computer living on an alien spacecraft together with the personalificiation of the computer via a living body is excellently done by Leo McKern. But again, he do talks a lot and what did bother me is once Delmer Plebus Powells Gwent dies he lays in a coffin, but it's so easy to see that he is still breathing and I guess they noticed it while editing because when closing in suddenly you see the film freeze.

Nevertheless, it's one of those episodes that has conversations all over and some battle going on in between.

Gore 0/5 Nudity 0/5 Effects 1/5 Story 2/5 Comedy 0/5

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Release Date:

8 January 1976 (UK) See more »

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Sound Mix:




Aspect Ratio:

1.33 : 1
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