Utopia
S3, E11: Capt Jack Harkness storms back into The Doctor's life, and the TARDIS is thrown to the end of the universe itself as The Doctor finds himself pitted against one of his oldest adversaries.

S3, E11: Capt Jack Harkness storms back into The Doctor's life, and the TARDIS is thrown to the end of the universe itself as The Doctor finds himself pitted against one of his oldest adversaries.