The series is centered around the adventures of Flint Hammerhead, a boy from the prehistoric era who was resurrected from his fossil prison and became a Time Detective, although his competency as a detective is dubious.
Usually, he fought against Petra Fina and her cronies Dino and Mite (very reminiscent of Marjo, Grocky, and Walther from Time Bokan), servants of the Dark Lord.