Aardman Animation studios has released two images from its first full-length computer-generated film, Flushed Away.
Shane Richie and Hugh Jackman voice rats Syd (l) and Roddy (r)
The film, about an upper-crust rat's adventures in an underground rodent metropolis, is being produced at the Dreamworks studios in California.
The animal characters were moulded in Plasticine, then scanned in 3-D and recreated as computerised images.
Hugh Jackman, Kate Winslet, Bill Nighy and Sir Ian McKellen supply voices for the movie, to be released in December.
Also featured are French actor Jean Reno, King Kong star Andy Serkis and former EastEnders cast member Shane Richie.
An Aardman spokesman said it had no plans to drop the plasticine animation used in the Wallace and Gromit films.
The action takes place in the bustling sewer world of Ratropolis
However, he said computer animation was "a natural progression for the studio".
"Another reason we are making this film in CG [computer-generated] is water," he continued.
"The sewers of London are full of water, which is almost impossible using traditional 3-D animation."
Aardman is also returning one of its first creations - plasticine hero Morph - to the small screen. Morph is to return in 35 shorts specially designed for mobile phones.