6/6 Professor Quanderhorn is executed.
5/6 The Martians fire the weapon-melting ray, leaving Earth defenceless to the invasion fleet.
4/6 The crew are trained in Martianosity to infiltrate the Mothership, with variable success.
3/6 The crew return to the near past to prevent the bombs from eradicating reality.
2/6 Brian, Guuuurk and Troy are condemned to death for crimes against Interior Decoration.
1/6 Can Quanderhorn (James Fleet) and his trepid crew save the world from the end of reality?
6/6 Troy (Freddie Fox) tries to comfort a dying Brian (Ryan Sampson). And fails.
5/6 The professor (James Fleet) receives a call from his future self with a dire warning.
4/6 Jenkins (John Sessions) discovers the crew have taken the lift to the Moon.
3/6 Dr Janussen (Cassie Layton) discovers a terrible secret about the giant broccoli monster.