The Fifth incarnation of the Doctor, initially annoyed by what he believes is a fan intruding in the TARDIS. He gradually accepts the Tenth Doctor as his future self after witnessing the paradox resolution, shares a reflective moment about their shared traits, and ultimately departs to a separate timeline while issuing a crucial warning about the TARDIS shields.
The tenth incarnation identifies the fifth as his own earlier timeline.
Explore the full interactive character relationship map of Doctor Who: Time Crash