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Episode #50 - The Call: Part 1 (Batman Beyond)
Original Airdate - November 11th, 2000
Superman drafts Batman into the League of Superheroes when he suspects there is a traitor among them. Batman ferrets out the traitor, and the reason for his treasonous behavior. It all comes down to a one-on-one battle between Batman and one of the greatest heroes of all time.
Episode #51 - The Call: Part 2 (Batman Beyond)
Original Airdate - November 18th, 2000
Batman must go up against the traitor within the JLA ranks, which will have lasting repercussions on Batman, and the JLU itself.