16 November 2007
|Written by||Steven Moffat|
|Directed by||Graeme Harper|
|Produced by||Julie Garner and Phil Colinson|
The Tenth Doctor is overjoyed to meet his past self, but the Fifth Doctor is annoyed, he believes his counterpart to be a fan that broke into the TARDIS. the Fifth Doctor does a scan that shows two TARDISes have merged, two time zones at the heart of the TARDIS is a paradox that could cause a massive black hole. The Tenth explains that he forgot to put the shields back up after repairing the TARDIS. As the black hole begins, the Tenth Doctor counters it with a supernova.
An impressed the Fifth Doctor realises that he will remember the solution, having observed the Tenth Doctor performing it (who in turn remembered from when he was the Fifth Doctor. He now believes this “skinny idiot” is his future self. The Tenth asks the Fifth where he is in his timeline, but doesn’t get an answer as his past self begins fading. Before the Fifth Doctor departs, the Tenth Doctor leaves him a heartfelt message: