Space: 1999 - The Infernal Machine

The Mysterons themselves arrive on Earth to destroy Cloudbase...or do they?Special guest: Paul McGann

When the Terrahawks are rendered catatonic by space flowers, Zero is forced to battle for the cure on his own.

Haldane and Jane escort Houdini, the most notorious escape artist on Altor, to asteroid A5 – the maximum security penitentiary known as "The Rock". But on their arrival at the asteroid, the two officers are horrified to discover that the prisoners have taken over and mass murderer Eric Volker is the new warden.With special guest Henry Shields.

The Fireflash, on its maiden flight from London to Tokyo, is sabotaged by the Hood, an Asian criminal who has learned of the formation of International Rescue, and is unable to land. The Hood's attack is intended to draw out International Rescue so he can record secrets of its machinery for sale to the highest bidder, an attempt thwarted by the intervention of the organization's London Agent.

Commander Shore and Phones are captured by an undersea pirate who has turned an antique galleon into a submarine.With special guests Sophie Aldred and Nicola Bryant.

The Terrahawks find a teddy bear-like alien adrift in a space capsule and take him back to Hawknest. However, he is actually one of Zelda's monsters and begins to wreak havoc in the base.With special guest Stephanie Laing

Disappearances of robots are linked to Professor Himber. With Robert missing, Zodiac and Matic travel to Planet 82 only to be put on trial by the professor – who is ruler of his kidnapped robot race.Special guest: Matt Richardson

The Alphans are visited by a bizarre spacecraft, whose request for supplies hides a deeper purpose. The ship, Gwent, is found to be sentient, the attempt of a vain alien genius to live forever. Powerful, unstable and craving companionship, Gwent intends for Koenig, Helena and Bergman to replace its aged, dying creator.With special guest Wendy Wason.

In the small town of Ragnarok in Alaska, which the Mysterons have destroyed and replicated, Scarlet and Blue are captured and forced to help mine for an ancient meteorite bearing a spore that can kill all life on Earth.

A pair of convicts break out of a Canadian jail and threaten to kill the country's prime minister unless they are given a generous ransom.