The Doctor (Patrick Troughton), Jamie and Zoe arrive on the peaceful planet Dulcis for a holiday, only to find it invaded by the cruel Dominators and their vicious robot servitors, the Quarks. They must convince the placid Dulcians of the threat their world faces before the Dominators enslave them and destroy their world.

One of the lesser-known Powell and Pressburger collaborations. During the Second World War, scientist Sammy Rice (David Farrar) works at a British research unit set up to solve the enemy's methods of attack. Embittered after losing a foot in a bomb blast, Sammy is increasingly seeking solace in drink. However, a budding romance with his secretary, Susan (Kathleen Byron), and the challenge of analysing a new German bomb provide him with a new sense of meaning.

Triple bill of war dramas set at sea. In 'For Those in Peril' (1943), Pilot Officer Rawlings (Ralph Michael) is turned down by the RAF for air service on medical grounds and instead joins Air Sea Rescue, helping to pull downed Allied airmen out of the sea. Rawlings is initially resentful of his new job, but gradually comes to appreciate its importance. When the crew of a Boston bomber become stranded at sea in a dinghy, Rawlings and his colleagues become involved in a race against time - and the elements - to save their lives. 'San Demetrio, London' (1943), set in 1940 during the battle of the Atlantic, is based on a true story. The crew of the petrol tanker San Demetrio are left with a near impossible task when she is torpedoed by the Germans. The crew are forced to abandon ship in three lifeboats. Two are picked up by other ships in the convoy, but the third drifts for days until its crew spies the burning San Demetrio on the horizon. Do they board the ship, try to put out its fires and get it back to English shores or do they stay in the drifting lifeboat in the hope of being rescued? In 'The Cruel Sea' (1953), based on the novel by Nicholas Monsarrat, World War Two Lt. Commander Ericson (Jack Hawkins) has already lost one ship to an enemy attack when he is given command of the frigate Saltash Castle. A subsequent confrontation in the North Atlantic tests Ericson's leadership to the limit once again, as he risks sacrificing the lives of his crew for the greater good.

Young Jim Hawkins (Bobby Driscoll) finds himself set for adventure on the high seas when he is entrusted with a treasure map by ailing pirate Billy Bones.The map shows the location of treasure buried by Bones' former captain, Flint. Other members of Flint's crew are also after the booty, so Jim is accompanied by Squire Trelawney and Doctor Livesy as they make their way by sea to the island where the treasure is hidden. However, some of Flint's crew, led by the one-legged John Silver (Robert Newton), have managed to inveigle their way aboard Jim's ship as crew members, and will stop at nothing to get their hands on the treasure.