Kodai Ouja Kyouryuu King: D-Kids Adventure

Dinosaur King

Dr. Taylor was on a paleontology mission with his son, Max in Africa. Rex, Max's best friend, joins along as well. When Max had stumbled across some magic stone slabs with images of dinosaurs, the boys and their friend Zoe were being called out by the dinosaurs for help. It seems that an evil organization called the "Alpha Gang", led by the nefarious Dr. Z, traveled back in time to hunt down the dinosaurs so that they could take over the world by using those dinosaurs. It is up to Max, Rex, and their friend Zoe to travel around the world, defeating Dr. Z and the Alpha Gang while hunting down the dinosaurs.

(Source: Wikipedia)