The new story will also be the first meeting of Leela (Louise Jameson) and K9 (John Leeson) with the implacable silver giants.

The stage will be set in the June release The Fate of Krelos, in which the TARDIS lands on an alien world facing its most dangerous time. Michael Cochrane (Black Orchid/Ghost Light) guest stars as Geralk, while Veronica Roberts (Tenko) is Relly.

The Doctor’s past will then catch up with him in Return to Telos, which features the Cybermen’s adopted home world, and includes the return of Frazer Hines as Jamie, while Bernard Holley reprises his role as Peter Hayden from Tomb of the Cybermen.

“I don’t want to give away too many secrets,” says writer and director Nicholas Briggs, “but I can reveal it features the Tomb-era Cybermen, with those wonderful monotone voices. They presented an interesting challenge – I got quite a headache using the electronic larynx. And Peter Hayden is indeed part of the story, even though he died suddenly at the end of Tomb’s first episode! How can that possibly work? You’ll have to wait and see…

“And we have Frazer back as Jamie, in a Fourth Doctor story… the black and white and colour eras of Doctor Who collide on audio in one exciting story.”

The Fate of Krelos and Return to Telos round off the fourth season of The Fourth Doctor Adventures. A fifth season starts in 2016, and sees the return of Lalla Ward as Romana.

Season Four can be purchased as a discounted bundle, which includes the eagerly awaited Doctor Who: Philip Hinchcliffe Presents.