depleted by his travels

Superman's been dragged through a series of gladiatorial combats on a planet called WarWorld,

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 much of his power has been depleted by his travels,

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and now he's facing the big bad himself, Mongul, in a hand to hand showdown to try and save the life of another gladiator,

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a guy named Draaga. (They adapted an episode of Justice League in the early 2000's from this story.)