Julie Hesmondhalgh and Lee Mack are to appear in "Doctor Who" episode "Kerblam!"
The BBC have confirmed that the former "Coronation Street" actress and "Would I Lie to You?" comedian will guest star in the upcoming episode, which will kick off when a mysterious message arrives in a package addressed to the titular Time Lord (Jodie Whittaker).
The seventh episode - which is written by Pete McTighe and directed by Jennifer Perrott - will see the Doctor, Graham O'Brien (Bradley Walsh), Yaz Khan (Mandip Gill) and Ryan Sinclair (Tosin Cole) investigate the warehouse moon orbiting Kandoka and the home of the galaxy's largest retailer, Kerblam!
The BBC have also confirmed the eighth episode is called "The Witchfinders", which will see the space and time travelling gang's arrival in 17th century Lancashire, where they will be embroiled in a witch trial run by a local landowner.
The intense ep - which features the arrival of King James I - will lead the Doctor, Ryan, Graham and Yaz to discover that something even more dangerous is threatening the safety of the people of Bilehurst Cragg.
Downtown Abbey's Siobhan Finneran and "Emma" actor Alan Cumming will guest star in the gripping episode, which is written by Joy Wilkinson and directed Sallie Aprahamian.
Lee opened up about his own guest appearance earlier this year, admitting he "harassed" showrunner Chris Chibnall for a part in the show.
He said: "I am blink-and-you'll-miss-it. It's just a little thing. I've just been a fan all my life, so I just harassed them until they gave me a little part in it.
"I even sent Chris, who runs the show, Chris Chibnall, a video of me getting out of my own TARDIS, which I own. With a Dalek, which I own as well. And I said "Come on!"
"It's genuinely a true story - I've got a TARDIS at home, it's not bigger on the inside. And I said "Come on, give me a part."
"And he said "Alright!" So that's what you need to do if you want a part in something. Just send a video to someone, you'll get the part."