“Time Crash” is aÂ mini-episodeÂ of the seriesÂ Doctor Who. It was broadcast on 16 November 2007, as part of theÂ BBC OneÂ telethonÂ for the children’s charityÂ Children in Need. It was written byÂ Steven Moffat, it starrsÂ David Tennant (Tenth Doctor)Â andÂ Peter DavisonÂ (Fifth Doctor).
The episode takes place within the final scene of “Last of the Time Lords”. After theÂ Tenth DoctorÂ andÂ Martha Jones (Freema Agyeman) get to their separate ways he tries taking of but theÂ TARDISÂ to spin wildly and sound an alarm. Checking out the systems, the Doctor passes someone else doing the same thing: hisÂ fifth incarnationÂ (Peter Davison). The Tenth Doctor recognizes his past self and is overjoyed to see him, gently poking fun of his particular eccentricities, such as the unneeded glasses he sometimes wears. The Fifth Doctor is annoyed, believing his counterpart to be a fan who has broken into the TARDIS.
The Fifth Doctor discovers that two TARDISes have merged, a paradox that will cause a massive black hole. The Tenth Doctor counters it with aÂ supernova, a solution he remembers seeing himself perform in this same incident (aÂ predestination paradox); the Fifth Doctor realizes that the Tenth really is his future self.
As the time streams split, the Fifth Doctor calls out, warning the Tenth to put his shields up. But it is too late; theÂ TitanicÂ collides with the TARDIS, leading the narrative into “Voyage of the Damned”.