Mazu, Tiny, Rocky and Bill are back for another prehistoric adventure. After discovering a lost dinosaur egg, the four friends try to get it back to its herd. The only problem is, they can’t find which herd it belongs to! Rocky is losing his patience – he just wants to play, why should he have to care for a silly egg! But, when he sees Gigantosaurus (the toughest dinosaur of them all) be gentle with the lost egg, he realises it’s ok to show your softer side after all.