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Starring Sylvester McCoy as the seventh Doctor and Peter Davison as the fifth Doctor. A newly regenerated fifth Doctor arrives on an occupied ice planet, one where the seventh Doctor is investigating dangerous energy experiments conducted by the Earth Empire. But events spin out of control when a refugee from the distant past arrives, Patience, the Doctor's wife! Cold Fusion is based on the novel by Lance Parkin from the Virgin New Adventures series of Doctor Who novels.