The show is about Flint Hammerhead, a boy from prehistoric time who was resurrected from a fossil, and they decided to make him a Time Detective... ? He has friends to help him on his mission Sarah and Tony Goodman, they are the brains he's the muscle. Flint also has his dad with him, Rocky Hammerhead (ironic name) who could not be resurrected fully so he's stuck as a flat square bolder that Flint used as a weapon. The missions are for them to go back in time, through different time periods in search of these 'cute' fury-like creatures called Time Shifters that have been scattered throughtime in order to protect the time line, before the bad guys do.

This series is similar to
Pokemon
Digimon
Dragonball

I haven't watch this in ages, so i'm unable to give a rating since i was very young back then and at my age today I might not find it as good.
But I will say that as a kid I really liked this show.