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Space: 1999
S1, EP14 "Earthbound"
Simmonds (Roy Dotrice) forces Koenig (Martin Landau) to let him take the place of a dead alien on an Earthbound ship.
S2, EP1 "The Metamorph"
Koenig and Helena appeal to the daughter of an alien ruler planning to use the Alphans as fuel for a biological computer.
S2, EP2 "Exiles"
Bizarre capsules circling Moonbase Alpha contain ancient killers in suspended animation.
S2, EP4 "One Moment of Humanity"
A race of superior robots forces Helena and Tony to teach it human emotions.
S2, EP18 "Bringers of Wonder"
Aliens disguised as friends from Earth trick all but Koenig.
S2, EP14 "Space Warp"
Delirious Maya endangers herself and the crew by transforming herself into an array of fearsome creatures.
S2, EP12 "A-B Chrysalis"
The Alphans discover the cocoons of deadly chlorine-breathing monsters (Ina Skriver, Sarah Douglas).
S2, EP11 "Seeds of Destruction"
Koenig is trapped in a crystalline asteroid cave, where his double emerges and returns to Moonbase Alpha.