Fancy a trip in the TARDIS?

"I need your help," says Doctor Who. "Fancy a trip in the TARDIS?"

And so begins Attack of the Graske, the interactive television program embedded in the transmission of the Doctor Who Christmas Special, The Christmas Invasion, which was broadcast on 25 December 2005 on BBC ONE.

Following the Christmas transmission, digital television users were able to access the program via the red button service, but it wasn't available anywhere else until now.

You can now watch the entire episode, and take part in the interactive adventure with the Doctor -- but it's a bit heavy on bandwidth, so the BBC has restricted access to users who live in the U.K.