As Ncuti Gatwa's Fifteenth Doctor exits Doctor Who, audiences can look back at these fifteen moments in which the actor truly shines as the Doctor.

It may seem like Ncuti Gatwa's adventures in time and space have been cut short, but the actor says that a 2-season arc was "always the plan."

In the climax of Saturday’s Finale of “ Doctor Who ” Series 15, Gatwa’s Doctor regenerates into Billie Piper, who previously played companion Rose Tyler in Series 1 (2005) and Series 2 (2006). She also made a brief appearance as Rose Tyler in Series 4 (2008) and was in the “Doctor Who” 50th anniversary special in 2013.