'Attack of the Graske' by Gareth Roberts

"I need your help! Do you fancy a trip in the TARDIS?" - The Doctor

Having dropped Rose off at an Abba concert in 1979, the Doctor investigates an alien presence on Earth. You join him just as he is attempting to determine which member of an apparently normal family enjoying Christmas Day is in fact an evil impostor of the Graske – a race of evil alien midgets who insidiously take over worlds by abducting members of their population, placing them in stasis and then leaving a deadly duplicate in their place. Having established that the mother is the imposter, you and the Doctor watch as a Graske materialises in the living room and replaces the father as well. As the Graske disappears, the Doctor tracks him through the space / time vortex to London in 1883; here the Graske attempts to hide amongst the snow-bound streets, but together you and the Doctor manage to locate him; however, the Graske claims another victim, and the teleports back to his home planet of Griffoth. You and the Doctor give chase in the TARDIS, and while the Doctor remains in the ship, you solve a series of puzzles, each of which unlocks a door along the corridor leading to the Graskes’ storage bay. When the Graske you followed spots you he opens fire, but the ricochet shatters a stasis pod containing a Slitheen, releasing the monster within. In the confusion you choose to reverse the Graskes’ controls, releasing the prisoners and returning them to their home planet. The Doctor will deal with the Graske another day; in the meantime he is very pleased with your actions, and may call on you for help again some time.

However, if you had made different choices during this mission, things could have gone much differently...

David Tennant (The Doctor), Lisa Palfrey (Mum), Nicholas Beveney (Dad), Mollie Kabia (Girl), James Harris (Boy), Robin Meredith (Grandad), Gwenyth Petty (Grandma), Jimmy Vee (Graske), Roger Nott (Older Man), Ben Oliver (Urchin), Catherine Olding (Young Woman)

Directed by Ashley Way
Produced by Sophie Fante
Executive Producers Russell T. Davies and Julie Gardner
A BBC Wales production

TX:
25th December 2005 @ 8.00 pm

Notes:,
*Featuring the Tenth Doctor and Rose

*Working title: 'Changeling World'

*This special interactive episode was available after the broadcast of 'The Christmas Invasion' on Christmas Day, and the repeat on January 1st 2006; it was accessible throughout both of those particular nights

*This story does not feature Billie Piper as Rose Tyler - instead you take on the role as the Doctor's companion!

*Music tracks: 'Rockin' Around the Christmas Tree' written by Johnny Marks and peformed by Brenda Lee, and 'Another Rock N' Roll Christmas' by Gary Glitter