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In the second episode of the four-part story "Planet of Evil," the Doctor (Tom Baker) and Sarah (Elisabeth Sladen), acting on behalf of the Moestran army, try to prevent misguided geologist Professor Sorenson (Frederick Jaeger) from transporting deadly anti-matter into the Universe. But these efforts may be too late: a ravenous monster has already sprung up from the planet Zeta Minor, poised to attack the Moestran probe. Written by David Maloney, "Planet of Evil, Episode 2" was originally broadcast on October 4, 1975.