There are 10,000 humans in stasis aboard Starship Future. Ten thousand humans expecting to wake up on a distant planet, their new home. But twenty years into their journey, Starship Future takes on board fuel – and something else. Something that’s been waiting, frozen in space, for a very long time.

Something malevolent.

Something with a plan.

Unless the Doctor can help, it looks like the people of Starship Future have no future at all..