Splendid, state-of-the-art animation allied to an appropriate cast and an infectious sense of fun are the keynotes of this charming cartoon version of Dr Seuss’s celebrated story.

Horton, the eponymous elephant, hears a cry for help coming from a speck of floating dust. Unknown to him, the mote contains the entire microscopic city of Who-ville and its tiny inhabitants. Horton goes on to prove himself a hero by saving Who-ville from destruction by disbelievers.

Ideal vocal casting — Jim Carrey as Horton, Steve Carrell speaking for the Mayor of Who-ville, Seth Rogen (again) as Morton the Mouse — is a considerable asset. While it is a tad overextended for its material, brisk storytelling ensures children will still be amused.