Ncuti Gatwa regenerates into Billie Piper as he leaves Doctor Who

Ncuti Gatwa regenerates into Billie Piper as he exits Doctor Who in the series finale. Billie Piper, known for her role as Rose Tyler, returns to the show as possibly the new Doctor. Piper expressed delight in reprising her role in the "Whoniverse," making her the third woman to potentially play the Doctor. Gatwa, who played the Doctor for two series, expressed gratitude to fans and the show for the opportunity.