科学家、摇滚明星、漫画英雄、地球最后的希望Buckaroo Banzai和他的香港骑士们阻止邪恶的Lord John Whorfin为首的外星人回到PLANET 10,拯救地球的大冒险。Neurosurgeon/Rock Star/Superhero Buckaroo has perfected the oscillation overthruster, which allows him to travel through solid matter by using the eighth dimension. The Red Lectroids from Planet 10 are after this device for their own evil ends, and it's up to Buckaroo and his band and crime-fighting team The Hong Kong Cavaliers to stop them.