The Marshal's premature use of Jaeger's experiment is threatening to destroy Solos' atmosphere and the Doctor returns to Skybase to try and correct the damage.
Quest roles:
John Scott Martin(Dalek Operator), George Pravda(Denes), Paul Whitsun-Jones(Marshal), Garrick Hagon(Ky), Christopher Coll(Stubbs), John Hollis(Sondergaard), Martin Taylor(Corporal Norton), Damon Sanders(Solos Guard), Rick James(Cotton)