Returning to Gallifrey, a deadly game banned and derelict for centuries, has been reactivated.
This episode premiered 23rd November 1983 - USA
A cold war between two superpowers is being fought on Earth in the year 2084.
The Sea Devils launch their attack on Sea Base 4 with the Doctor and Tegan inside.
The Myrka continues its devastating attack on Sea Base 4 and the Doctor can only halt its progress temporarily.
The Silurians now have total control of Sea Base 4 and its proton missiles.
Teacher Jane Hampden is increasingly frustrated by the war games being played around the village.
The Malus's influence is asserting itself all over Little Hodcombe, and the war games take an unpleasant turn.
The Doctor and his companions find themselves grounded in the inhospitable planet of Frontios.
The Doctor, still trying to come to terms with the loss of the TARDIS, is surrounded by an impromptu firing squad.
Tegan manages to distract the Tractators and breaks their grip on the Doctor and Norna.
The Gravis become intrigued when Tegan inadvertently reveals that they travelled to Frontios by TARDIS.
In a deserted area of the London Docks, a group of fugitives appear from thin air, and are gunned down.
As survivors of the prison station fight the invaders, Dalek agents on Earth take steps to protect the time corridor.
A distress call is from the island of Lanzarote where an archaeological dig may have disturbed something alien.
On the volcanic planet of Sarn, Turlough finds evidence of an old colony of Trion, his home world.
The Master has been declared a messiah by the Sarns and under his influence they imprison the Doctor.
A volcanic eruption is threatening to destroy the inhabitants of Sarn, the Doctor manages to stabalise the seismic events but for how long? Turlough faces an agonising decision about whether to contact his home planet of Trion for help, he explains that he was sent away to Earth as an outlaw.
In the planets' caves war rages between government troops and the android warriors of Sharaz Jek.
Military captive Salateen tells Peri and the Doctor they are dying from spectrox tomaemia.
On Androzani Major, Sharez Jek insanely believes Peri will fall in love with him.
Events on Androzani reach a bloody climax. Morgus is ruined, exposed as the one funding Jek’s gunrunners.
The mysterious Professor Edgeworth has kidnapped twin human child genii, Romulus and Remus.
On Jaconda, Mestor’s cruel domination over the planet's population continues.
Mestor claims that all he wants is for the Sylvest twins to help him repopulate his home planet.
Mestor’s true plan is revealed and the Doctor's old Gallifreyan friend Azmael comes to the realisation that he has been