David Tennant and Paul McGann are joining forces for 'Doctor Who: Time Lord Victorious'.
The two actors - who played the Tenth and Eighth Doctor respectively on the sci-fi show - will come together for two special audio adventures as part of Big Finish's final contribution to the BBC's multi-platform adventure.
'Echoes of Extinction' - which will be released on a limited edition vinyl on November 27 in UK ASDA stores, with a digital release following on December 4 - will feature a different incarnation of the Doctor on each side.
The synopsis reads: "Trapped, a haunted monster waits to consume new victims. It needs help. It needs a doctor.
"Unfortunately, it also needs to kill whoever it meets. Thrust into immediate danger, and on the back-foot, it will take all of the Doctor's ingenuity to triumph.
"Two interlinked adventures. Two Doctors. One foe."
David commented: "The Doctor in 'Time Lord Victorious' is a different character. He's slightly lonelier, slightly scratchier, when he doesn't have one of his pals to hold him back.
"But it's nice to tell stories from different times of his life. You just have to try and make sure you're in the right mindset. The script is fascinating.
"I've only got one side of it, but I'm very aware there's more to this story, that there's another Doctor on the other side of the disc. I look forward to getting my LP so I can listen to it all."
Paul added: "I've read this script twice through and I'm still none the wiser. I'm more confused after the second time than I was after the first. It's only while working on it that I've become aware of how it's going to be structured.
"It really appeals to me, the idea that it's in two parts, on two sides of vinyl. I think it's fun for people listening. Part of the excitement is when the different incarnations meet... or nearly meet."
The cast also features the likes of Arthur Darvill, Burn Gorman, Kathryn Drysdale, Paul Clayton and Mina Anwar.
Writer and producer Alfie Shaw said: "Director Scott Handcock has pulled together an amazing who's who of 'Doctor Who' for the cast. We've got alumni from the series as well as 'Torchwood' and 'The Sarah Jane Adventures.' "
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