KidsWB Oct 4, 2003 Yu-Gi-Oh Duel Monsters S2 Ep 40 Awakening Of Evil, Part 4

The counterfeit Ra knocks out Odion and Joey and Kaiba decides the winner will be whoever stands up first. Joey manages to stand first, allowing him to win the duel. Before passing out, Odion reveals his real identity and cryptically warns Joey that they will all now be in worse danger. Odion's lapse into unconsciousness allows Marik's evil half, Yami Marik, to surface and take control of Marik's body, since Marik needs Odion to help restrain his dark side.