Captain Jack Harkness reunites with the Doctor and the
TARDIS
is thrown out of control to the end of the universe. They meet
Professor Yana, who is working on a means to save the remnants of
humanity while a race known as the "Futurekind" attempt to thwart his
plans.
- This is Derek Jacobi's third involvement in Doctor Who and second time playing the Doctor's nemesis. The first was in the September 2003 audio drama Deadline,[3] where he played a screenwriter who believes himself to be the Doctor. The second was several months later, in the webcast Scream of the Shalka, where he played an android version of the Master.[4] David Tennant also had a minor, uncredited role in Scream of the Shalka.
- John Bell is a nine-year-old who won a Blue Peter competition to appear in this episode.[5]