With Spring Festival just around the corner, logger Vick learns that he has just been laid off for the holiday season. Trying to get another job, he finally gets employed as a Forest Ranger. At first, the Boonie Bears distrust Vick, but when a giant Super Chopping Robot arrives to log the entire forest, the animal gang must learn to trust their one-time enemy and work together to defend the forest!

憨八龟居住在遥远的外太空星球变形星，在一场意外中，憨八龟和朋友们搭载着飞船逃往其他的星球，却在途中遭遇了空难，憨八龟一人流落到了地球上。热爱幻想的少年阿布、大大咧咧性格开朗的少女小美和智多星明仔发现了憨八龟，一行人很快就成为了好友。
受憨八龟所托，三个人类少年决定帮助它寻找失散的伙伴们。而铁甲小子、宝宝熊和百丈跳等外星来客们亦在找寻着憨八龟的踪迹。和它们一起来到地球的，还有贪婪而又邪恶的星际罪犯软骨虫，在它的挑拨离间之下，地球人对变形星人产生了误解，爆发了矛盾。憨八龟和伙伴们携手，最终能否破解软骨虫的阴谋？