Dinosaur King

In the second season, the Alpha Gang and the Ancients return. While the parents are talking, they are kidnapped by Gavro, a member of the Spectoral Space Pirates. This causes the Alpha Gang and D-Team to join forces against the Space Pirates in their plot to obtain the Cosmos Stones. Seth later returns as an ally to the Spectoral Space Pirates. Spectre, the leader of the Space Pirates, provides the dinosaur cards. However in episode 75, Seth seems to become a traitor as he appeals to the D-Team for help, saying that they forced him to help them. However, it was really a trick to get the two Cosmos Stones in D-Team's control, despite the fact that he attacks and defeats his comrades two episodes later. In the end, although the Spectoral Space Pirates manage to catch all 7 Cosmos Stones, Seth and the Pterosaur defeat the Black Pterosaur. Rex, his parents, and the Alpha Gang leave as the Spectoral Space Pirates are floating around in a pod.