Monty Python star John Cleese is writing the next feature film for Aardman Animations, the makers of Wallace and Gromit have announced.
Aardman co-founder Peter Lord said the Fawlty Towers actor was currently writing the "pre-historic comedy".
"It will be great comedy adventure about a pre-historic culture clash between two tribes, one comparatively evolved tribe, and one un-evolved tribe," he said.
"Some might consider one tribe might be the English, and some might consider that the other to be the French, the Gauls.
"Let's just say it's the start of the Entente Cordial and it explains why the English Channel is there."
Lord was also joined at the festival by the Oscar-winning Nick Park to reveal a sneak preview of The Curse Of The Were-Rabbit, which is also in production and due to be released in the autumn.
It is the latest Wallace and Gromit adventure to follow-up the TV successes of A Grand Day Out, The Wrong Trousers and A Close Shave.
The film features the voices of Helena Bonham Carter, Ralph Fiennes and comedian Peter Kay.
It follows Wallace (Peter Sallis) and his dog Gromit as they hunt for a mysterious beast which is destroying the entries in the town's Giant Vegetable Competition.