The TARDIS picks up a distress call and the Doctor and Sarah arrive on the planet Zeta Minor. There they discover that a Morestran geological expedition has fallen prey to an unseen killer and only the leader, Professor Sorenson, remains alive.A military mission from Morestra has also arrived to investigate. The culprit is revealed to be a creature from a universe of antimatter, retaliating for the removal by Sorenson of some antimatter samples from around the pit that acts as an interface between the two universes.
The Morestrans take off in their ship, but it is slowly dragged back towards the planet due to the antimatter on board. Sorenson himself becomes infected by antimatter and gradually transforms into antiman, a monster capable of draining the life from others.
The Morestran commander, the increasingly unhinged Salamar, attacks Sorenson with a radiation source but this only causes him to produce multiple anti-matter versions of himself, which soon overrun the ship. The Doctor finds the original Sorenson, takes him back to the planet in the TARDIS and throws both him and his samples into the pit, fulfilling a bargain he earlier made with the anti-matter creature. Sorenson reappears unharmed, and the Doctor returns him to the Morestran ship, which is now freed of the planet's influence.
Cast
Doctor Tom Baker (Fourth Doctor)
Companion Elisabeth Sladen (Sarah Jane Smith)
Guest stars
Frederick Jaeger — Sorenson
Ewen Solon — Vishinsky
Prentis Hancock — Salamar
Graham Weston — De Haan
Louis Mahoney — Ponti
Michael Wisher — Morelli
Terence Brook — Braun
Tony McEwan — Baldwin
Haydn Wood — O'Hara
Melvyn Bedford — Reig
Production
Writer Louis Marks
Director David Maloney
Script editor Robert Holmes
Producer Philip Hinchcliffe
Executive producer(s) None
Production code 4H
Series Season 13
Length 4 episodes, 25 minutes each
Originally broadcast September 27–October 18, 1975
source: wikipedia
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