The Tardis is about to be crowded. Seven actors who played Doctor Who will reunite for an audio adventure through Big Finish. Once and Future, an eight-part audio drama, will release throughout 2023 in time for Doctor Who’s 60th anniversary.

The line-up includes Tom Baker, Peter Davison, Colin Baker, Sylvester McCoy, Paul McGann, Christopher Eccleston, and David Tennant. They are also expecting dozens of other guest stars that will be revealed at a later date.

“The Time War. The Doctor has been injured and brought to a Time Lord field hospital. His body glows with energy, but this is no regeneration into a future form – instead, the Doctor’s past faces begin to appear as he flits haphazardly between incarnations,” Big Finish’s official synopsis reads.

“Staggering to his Tardis, the Doctor sets out to solve the mystery of his ‘degeneration.’ Who has done this to him? How? And why? From the Earth to the stars, across an array of familiar times and places, he follows clues to retrace his steps, encountering old friends and enemies along the way. Tumbling through his lives, the Doctor must stop his degeneration before he loses himself completely,” the synopsis continues.

The Once and Future audio series runs from May to November 2023, with hour-long specials released on a monthly basis. All eight episodes are open for preorder on the Big Finish website as a digital download or special edition CD (limited to 3,000 copies). The CD will include bonus art and additional content like music suites and behind the scenes interviews.

“An astonishing array of talent has come aboard to be a part of this epic eight-hour anniversary story. It’s a huge Doctor Who party and a massive celebration that has been years in the making,” Once and Future producer David Richardson said.