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In the third episode of the four-part story "The Twin Dilemma," the Doctor (Colin Baker) and Peri (Nicola Bryant) have been abducted by the giant slug Mestor (Edwin Richfield), who has also kidnapped twin mathematicians Romulus and Remus Sylvest (Gavin and Andrew Conrad). Mestor intends to force the twins to help him unleash millions of deadly Gastropod eggs upon the Universe -- and, of course, the Doctor and Peri must be killed in the process. Written by Antony Steven, Doctor Who: The Twin Dilemma, Episode 3 was originally telecast on March 29, 1984.