The central protagonist who accidentally collides with his past self due to leaving the TARDIS shields down, creating a universe-ending paradox. He resolves the crisis by replicating a supernova event he already experienced, embraces a predestination loop, and reflects on traits he retained from his fifth incarnation before parting ways.
The tenth incarnation identifies the fifth as his own earlier timeline.
Explore the full interactive character relationship map of Doctor Who: Time Crash