Classic British sci-fi adventure starring Tom Baker. The Doctor and Leela investigate when a comet strikes the sea, an eerie fog rolls in and a lighthouse keeper dies mysteriously.

Classic British sci-fi adventure starring Jon Pertwee. Jo learns of the Dalek plot to release a bacteria that will kill all unimmunised life, leading to a two-pronged attack on their base.

Classic British sci-fi adventure starring Jon Pertwee. The Doctor and his cohorts strive to thwart the Dalek's evil scheme just as more of their number arrive, including the Dalek Supreme.

Classic British sci-fi adventure starring Jon Pertwee. While the Doctor plans a holiday, Jo and the Brigadier look into a death at a coal mine that's been blamed on a chemical company.

Classic British sci-fi adventure starring Jon Pertwee. Global Chemicals prove to be very uncooperative when the Doctor and the Brigadier try to rescue Jo and Bert from the mine.

Classic British sci-fi adventure starring Jon Pertwee. When the Doctor and Jo escape the mine with a maggot egg, Stevens is determined to stop them analysing it.

Classic British sci-fi adventure starring Jon Pertwee. The Doctor infiltrates Global Chemicals looking for answers, while the Brigadier calls in a full UNIT force to tackle the huge maggots.

Classic British sci-fi adventure starring Jon Pertwee. When the Doctor engineers his escape from BOSS, he discovers that Cliff has been infected by a giant maggot.

Classic British sci-fi adventure starring Jon Pertwee. The Doctor tries to destroy the maggots and cure Cliff, but the real danger is BOSS, who is set to take over the world's computers.

Classic British sci-fi adventure starring Jon Pertwee. The Brigadier asks the Doctor to search for a number of missing scientists who, he discovers, have been sent back in time.

Classic British sci-fi adventure starring Jon Pertwee. The Doctor traces the scientists to Irongron's castle where they have been put to work repairing a spaceship and creating weapons.