Dr. Kieda, a somewhat wacky but intelligent scientist, has finally succeeded in inventing insect-shaped all-terrain time machines called "Time Bokan". To prove its efficiency and safety, he decides to serve as the very first guinea-pig for its maiden voyage. However, by the time the machine returned, he isn't anywhere inside. The only thing that returned with it is a talking parrot, along with a large gemstone called the Dynamond, which is seemingly the most powerful and valuable jewel in the world. Now it is up to a search party, founded by Dr. Kieda's lab assistant Tanpei, to travel though time to find Dr. Kieda; but it seems that someone power hungry is looking for the "Dynamond"