Welcome back to Doctor Who, Billie Piper! The British sci-fi series just shocked fans when, in the Season 2 finale, Ncuti Gatwa ‘s Doctor regenerated — and the Sixteenth Doctor appears to be played by none other than Piper!

In a shocking turn, Ncuti Gatwa's Doctor regenerates into Billie Piper's Rose Tyler in 'Doctor Who,' leaving fans stunned. Rose, a beloved companion of the Ninth and Tenth Doctors, returns after being trapped in a parallel universe in 2006.

On social media she reflected on her return and teased ‘who, how, why and when, you’ll just have to wait and see’. And the BBC added: ‘Just how and why she [Billie Piper] is back remains to be seen…’ while showrunner Russell T Davies echoed ‘quite how and why and who is a story yet to be told’.