Yu-gi-oh

From Animepedia

3000 Years ago marked the turning point of an Egyptian Dynasty; the Pharaoh's spirit was sealed inside one of the ancient relics, the Millennium Puzzle, after saving the kingdom from an enemy army. Now, in the present age, the Millennium Puzzle is found by a young boy, Yugi Mutou, who unlocks the spirit of the puzzle and is possessed by the sprit of the old Pharaoh, who lost all of his memories from his old life. As a thank you to the spirit who saved him from bullies and gave him new friends, Yugi decided to help the spirit out and find a way to recover his lost memories and send him to the after life. [from animenewsnetwork.com] The series has five seasons (not counting one season never aired in the U.S.), two spinoffs (one of which is currently being aired in Japan), and two movies. The list of story arcs are as follows:

A Shadow Game (not aired in the U.S.)

Duelist Kingdom

Battle City

Virtual world

Battle City Finals

Orichalchos Saga

Kaiba Corp Grand Championship

Memory World

Ceramonial Battle (last four episodes)