Broton the Zygon warlord intends to use the Skarasen to attack London.
The Doctor and Sarah find their way into the Zygon spaceship at the bottom of Loch Ness.
Sarah is attacked by a Zygon disguised as Harry.
Something is destroying oil rigs off the coast of Scotland. UNIT investigates!
The Doctor races to avert a nuclear holocaust and the robot takes Sarah hostage.
Sealed inside an underground bunker, Miss Winters issues her demands to the world.
Harry Sullivan is sent to infiltrate Think Tank to discover the truth.
UNIT are called in when top secret plans are stolen from high security establishments.
The Doctor returns to Metebelis 3 where he must face the spiders’ ruler, the Great One.
Sarah makes a bargain with the Queen Spider and returns to Earth with the Doctor.
The Doctor is in a coma and Sarah is held prisoner in the spiders’ larder.
Following Lupton, Sarah is accidentally transported to Metebelis 3 where she is captured.
Lupton, now under the control of a giant spider, steals the blue Metebelis crystal.
The Doctor receives a mysterious package from his old companion, Jo Grant.
Dinosaurs are all over London as Professor Whitaker initiates ‘Operation Golden Age’.
Sarah discovers that the spaceship passengers are all victims of a deception.
The Doctor is framed for causing the appearance of the dinosaurs.
The Doctor captures a Tyrannosaurus Rex as Sarah falls into enemy hands.
The Doctor plans to capture a dinosaur and discover who is bringing them through time.
The Doctor and Sarah return to London but find the city deserted.
His ship repaired, Linx prepares to take off as the Doctor races to stop history changing.
Linx is providing advanced weaponry to Irongron and his men.
The Doctor discovers that the alien is a Sontaran warrior called Linx.
Scientists go missing and the Doctor learns that the kidnapper is an alien from the past.