Sequel series to Kodai Oja Kyoryu King. The Alpha Gang and the Ancients return. While the parents are talking, they are kidnapped by Gunenco, a member of the Zanjark Space Aliens. This causes the Alpha Gang and D-Team to join forces against the Zanjark Space Aliens in their plot to obtain the Cosmos Stones. Seth later returns as an ally to the Zanjark space aliens. Jark, the leader of the Zanjark, provides the dinosaur cards