Season 11

Arriving back on modern-day Earth, the Doctor and Sarah discover London is deserted and under martial law. They eventually find an army patrol, but are arrested as looters, and are sent to a detention centre as prisoners. But as their journey begins, their transport comes under attack by a tyrannosaurus rex. The Doctor suspects a deliberate plan is causing the dinosaur menace, but who is behind the scheme? And when Sarah vanishes, just how does she find herself on a spaceship carrying hundreds of people in suspended animation towards a new life on a distant New Earth...?