Stephen Fry and Lenny Henry are joining Doctor Who's Jodie Whittaker in the first episode of the Time Lord's new series.
The BBC has said that both "are more than equipped to come face to face with the Time Lord and her friends, but will they be friend or foe remains to be seen..."
"Short of being picked for a British space exploration programme and I readily concede that I'm past the age where I’d be considered (if I was ever the right age for such a posting) - then being in an episode of Doctor Who will certainly do as a very sweet second-place excitement," said Fry.
"It was absolutely brilliant to be welcomed into the fantastical world of Doctor Who," said Henry.
"The nearest I have been to the TARDIS was when I played the Caribbean Doctor in the Lenny Henry Show, so as a life-long (hiding behind the sofa type) Doctor Who fan this is a very special moment for me."
Doctor Who will be back on BBC One in early 2020.
As Whittaker reprises her role as the Time Lord for a second series, she will be reunited with co-stars Tosin Cole (Ryan), Mandip Gill (Yaz) and Bradley Walsh (Graham).