Released: 
2007

Starring:
Paul McGann as the Doctor 
Sheridan Smith as Lucie 

Number of Episodes: 4 

Written by: Eddie Robson

The TARDIS lands on Phobos, moon of Mars — where extreme sports nuts of the future indulge their passion for gravity-boarding and wormhole-jumping. But there's something lurking in the shadows, something infinitely old and infinitely dangerous. It's not for nothing that 'Phobos' is the ancient word for 'fear'...

This story takes place after the TV movie.