Doctor Who Galaxy 4

William Hartnell stars as the eponymous Doctor in this animated serial from 1965. The Doctor lands on a planet in the midst of a civil war and teetering on the brink of total destruction. With his companions, Vicki (Maureen O'Brien) and Steven (Peter Purves), the Doctor tries to broker a peace deal between rival factions the Drahvins and the Rills.

The episodes are: 'Four Hundred Dawns', 'Trap of Steel', 'Air Lock' and 'The Exploding Planet'.