Fissures between dimensions open up, and it will require a lot of Doctors to...
Rassilon
The Doctor takes on the Time Lords themselves to save Clara.
The Tenth Doctor reaches the end of his journey.
The Seventh Doctor. "Silver Nemesis," Episode Two.
A mysterious force threatens the Doctor...in all his incarnations!
The Fourth Doctor. "State of Decay," Episode Three.
The Fourth Doctor. "The Invasion of Time," Episode Five.
The Fourth Doctor. "The Deadly Assassin," Final Episode.
