Writer, director and co-producer Gary Russell said: "There's a golden decade of kids' TV between 1972 and 1982, much of it produced by HTV and Patrick Dromgoole, often written by Bob Baker and Dave Martin. One of those gems was Sky, a show that displayed an intelligence and sophistication that many other ITV companies tried to emulate, but rarely did.

"The ultimate outsider, Sky was neither good nor evil, neither a hero nor a villain. The same goes for the other characters around him: Arby, Goodchild, the Briggs family – there are marvellous moral ambiguities about all of them. To a child, that offered a story of such depth and emotion and ethical shades of grey, it was impossible not to love.

"To be asked to find out what happened next, and the effect Sky's parting gift to Arby might have on a human, was too good an offer to say no to. I love these characters passionately and it's a joy to be able to tell these latest chapters in their lives – the first audio serial I've ever written for Big Finish."

His co-producer Dominic G. Martin added: "The tale of Sky is an absolute belter of a story! I was born long after it aired, and despite growing up on a lot of classic TV, I only learned about Sky from Gary Russell. Hearing that Bob Baker and Dave Martin were the original serial's writers made me instantly excited to get involved.

"It's a such a fascinating concept that you could pull off in any era with all its mysteries and dynamic characters. The whole cast was magnificent in the recordings – they were such a delight to work with, and I would love to think that the new series is not only a loving tribute to the work of Baker and Martin, but also builds on that grand story that they set up back in the 1970s, while keeping it accessible for a whole new generation to get immersed in."

Conrad Westmaas, Rachel Handshaw, Caitlyn Galvin, Tara Ward

Jessica Hayles, Cloud Quinn, Edwin Flay, Samuel Morgan-Davies