Doctor Who special The Waters of Mars is ‘one of the scariest’ according to star David Tennant.
The forthcoming special which sees the Timelord arrive on Mars in 2059 and battle terrifying zombie like aliens.
Viewers will see the Doctor meet the first human colony of people living on Mars, facing a battle to save them from a parasitic virus that makes them spurt water. In time honoured tradition the transformation scenes are sure to send children rushing to the back of the sofa.
The episode, which will broadcast on BBC1 on November 15, also shows him facing a moral dilemma about whether to condemn people to their fate or save them and ultimately change the future.