Classic Doctor Who: The Fourth Doctor

Harry Sullivan is sent to infiltrate Think Tank to discover the truth.

Sealed inside an underground bunker, Miss Winters issues her demands to the world.

The Doctor races to avert a nuclear holocaust. The robot takes Sarah hostage.

The survivors of Earth lie in hibernation but the Doctor finds there has been an intruder.

The survivors of the human race start to awaken. But The Doctor is concerned...

Humankind faces total destruction. Can the Doctor defeat the Wirrn?

Trapped by the Wirrn, The Doctor and his friends are forced into one last terrible gamble.

Arriving on Earth, the Doctor, Harry and Sarah meet a group of stranded human colonists.

Sarah has been captured by Styre who is conducting experiments on the captured humans.

The Time Lords send the Doctor to Skaro shortly before the creation of the Daleks.

In the Thal dome, Sarah is forced to load a war rocket with radioactive explosives.

The Doctor informs the Kaleds of Davros's experiments but Davros takes drastic action.

The Kaled dome is destroyed by the Thals' rocket but Daleks appear and a massacre begins.

Davros interrogates the Doctor, forcing him to reveal the future of the Daleks.

The Kaled elite move to prevent the development of the Daleks but is it already too late?

The Doctor, Sarah and Harry return to Nerva, but at an earlier point in time.

Sarah is the latest victim of the space plague.

The Cybermen who are intent on destroying Voga.

Their plan to blow up Voga thwarted, the Cybermen intend to crash Nerva into the planet.