The episode will feature two films shot before Jeremy Clarkson was suspended from Top Gear and eventually sacked.
To Gear co-presenters Richard Hammond and James May return to the studio to present links from the studio, with Jeremy Clarkson noticeably absent.
No date has been given for transmission, and the broadcaster has yet to decide how Top Gear may return.
Top Gear was pulled from the schedules after Jeremy Clarkson’s suspension for attacking a producer earlier this year.
Footage shot for the three remaining episodes has now been compiled in to one extended program.
It contains two films which, in classic Top Gear style, feature cheap bangers, caravans and a race to the finish line for the three presenters to avoid a forfeit.
Earlier this week, rumors circulated that Chris Evans was being groomed to take over the Top Gear hotseat from Jeremy Clarkson, after the Radio 2 DJ revealed he was making a “Top Gear sequence”.
It later emerged that the film was part of Chris Evans one-off edition of TFI Friday, in which his friend Jeremy Clarkson will appear.
Chris Evans has ruled himself out of the Top Gear job on a number of occasions.
There has also been speculation that the show could return with a different guest host every week.
It was reported last week Richard Hammond and James May had been offered £1 million ($1.5 million) deals to stay with the BBC, although they themselves have seemed to distance themselves from returning.
Jeremy Clarkson, Richard Hammond and James May have been appearing together in a series of live shows, which were originally meant to be under the Top Gear banner, but have since been rebranded Clarkson, Hammond and May Live and stripped of all BBC branding.
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