Back up to: Season 20
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.