Ncuti Gatwa regenerated into Billie Piper in the series finale of Doctor Who on Saturday night. He left the role after playing the iconic character for two series. Piper, who previously played the Doctor's assistant, Rose Tyler, said the opportunity to "step back on that Tardis one more time was just something I couldn't refuse".

Following his surprise regeneration in The Reality War, Doctor Who star Ncuti Gatwa has confirmed his exit after just two seasons was always part of the plan. In a behind-the-scenes video shared on YouTube,