The Day of the Doctor

The 50th Anniversary Special of Doctor Who was an episode of two halves - one was a fairly standard romp with shape-shifting aliens invading from the Elizabethan-era...the other was a monumental tying up of loose ends and creating story hooks with one of the most popular Doctors of all time.

The Day of the Doctor focuses on three incarnations of the Doctor. Matt Smith, the current Doctor. David Tennant, the previous incarnation. And John Hurt, the "lost" in carnation - the War Doctor.