The ursine protagonists are largely relegated to fart-gag sidekicks in this phoned-in attempt at a dystopian sci-fi

When George Michael recorded Careless Whisper, there can be no doubt his ultimate ambition for it would have been to soundtrack a garish animated sequence in which two anthropomorphic bears gambol through a prairie of giant fungus experiencing ecstatic visions as hallucinogenic spores rain down on them. Such is the frantic way of this Chinese cartoon franchise, as relentless and exhausting as ever in its 11th feature-film instalment. Five minutes in, before the credits, it has crammed in a post-apocalyptic prologue, oodles of eco-babble, a time-travelling tyke and an avalanche.

This latest one jumps on the fungal-panic bandwagon: Saylor (voiced by Nicola Vincent in the English-language version) has nipped back 100 years to locate the original spores at the root of a pestilence that has eradicated most of life on Earth. It turns out that hapless nature guide Vick (Chris Boike), seen polluting the forest with his tourists, was responsible for spreading them After Saylor fails to kill the mushroom in the cradle, the pair – along with Vick’s forest buddies, the bears Bramble (Joseph S Lambert) and Briar (Patrick Freeman) – are whisked back to the future. They discover a fungus-carpeted nightmare of a planet, overshadowed by a giant skyscraping toadstool.