A lost episode of Dad's Army will be seen for the first time since it was aired almost half a century ago - but only in animated form.
The recently discovered high-quality audio recording of the episode, titled A Stripe For Frazer, will be used to create an animated version.
The sitcom about the British Home Guard during the Second World War was originally broadcast on the BBC from 1968 to 1977. In total, there were 84 episodes.
But many tapes of programmes from this era were either recorded over or discarded, meaning that this episode - which aired on March 29 1969 - was lost, seemingly for good.
However, in the run-up to the new Dad's Army feature film next month, the story will be recreated by animators using the salvaged audio recording.
In A Stripe for Frazer, Captain Mainwaring makes Frazer a lance corporal - but soon regrets doing so.
Newly promoted Frazer competes with Lance Corporal Jones for Mainwaring's favour. He resorts to issuing a series of increasingly bizarre charge sheets, to the consternation of Mainwaring and other members of the platoon.
Jonathan Green, director of new digital service BBC Store, said: "As the UK renews its love affair with Dad's Army, we're delighted to be bringing fans an exclusive chance to buy this brilliant lost episode which has been missing from the Dad's Army portfolio for nearly half a century."
The episode will be available on BBC Store from February 4. The film Dad's Army will be released on February 5.