“Superheroes: A NEVER-ENDING BATTLE” (8 P.M., PBS): This three-hour special traces the

“Superheroes: A NEVER-ENDING BATTLE” (8 P.M., PBS): This three-hour special traces the evolution of the comic book.

“The Biggest loser” (8 p.m., nbc): “American Idol” winner Ruben Studdard is a contestant.

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