4/4 The Garm and the pirates stop Terminus from setting off a second Big Bang.
3/4 The Doctor finds the pilot of Terminus and realises a mistake is about to be made.
2/4 Bor solves the mystery at the heart of Terminus itself.
1/4 Turlough sabotages the TARDIS causing it to fuse with the space station Terminus. (R)
4/4 Turlough plots with the Black Guardian to bring the Doctor down once and for all.
3/4 Mawdryn and his eternal mutants are awake and reveal the truth.
2/4 Both Tegan and the Doctor meet the Brigadier but in different time periods.
1/4 Caught in a warp ellipse, the TARDIS is drawn to a huge spacecraft orbiting Earth.