A special episode of 'Doctor Who' to mark the BBC's Centenary will see the return of two former companions.
The Master, the Daleks and the Cybermen are all set to return later this year for Jodie Whittaker's final outing as the Time Lord in the BBC cult classic.
However, fans will be most excited to hear that Janet Fielding is set to reprise her role as Tegan Jovanka - which she played from 1981 and 1984 - and Sophie Aldred will be back as Ace, the companion to Sylvester McCoy’s Doctor from 1987 to 1989.
Sacha Dhawan will return as the Doctor's enemy The Master.
And Vinder (Jacob Anderson) and Kate Stewart (Jemma Redgrave) are also set for a comeback.
Showrunner Chris Chibnall said: "Jodie's final feature-length story contains a plethora of treats and surprises for audiences and fans, not least the return of two of the most beloved companions in the show's history. They'll be helping the Doctor fight on three fronts, against her deadliest enemies: the Master, Daleks and Cybermen, in one huge story!
For the BBC's Centenary, we'll be celebrating the past, present and future of Doctor Who, in a fittingly thrilling, epic and emotional send-off for the Thirteenth Doctor."
Janet Fielding said: "In some ways it was a very different experience to what it was like when I finished recording in 1983, but in many ways it was very similar. It was so lovely to be a working member of the Doctor Who family again."
Sophie Aldred commented: "It's been quite a challenge to have such a big secret to keep, even from my family, and I couldn't be more thrilled and excited to have been asked back. I hope everyone enjoys it as much as I adored being part of the TARDIS team again."
Written by Chris Chibnall and directed by Jamie Magnus Stone, the feature-length special will air later this year as part of the BBC's Centenary celebrations, with further details to be confirmed in due course.
Following Jodie's final episode, Chris is also bowing out to make way for returning showrunner Russell T. Davies.