In the climax of Saturday’s Finale of “ Doctor Who ” Series 14, 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.

Gatwa’s brief but impactful era brought unprecedented representation and emotional depth to the Time Lord character, establishing new ground for the series while grappling with modern television’s co...

“It’s no secret how much I love this show, and I have always said I would love to return to the Whoniverse as I have some of my best memories there, so to be given the opportunity to step back on tha...