Totally Spies!

Planet of The Hunks (3x7)

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A rich and powerful princess (that's ""princess"" in the ""spoiled-brat"" way, not in the ""royal"" way) is abducting hunky men from around the world to keep in her ""human zoo"" for her own amusement. The spies are sent to investigate and find that after the princess grows tired of the men she's abducted, she puts them in a ""thunder dome"" type arena where they must fight for their own survival against her personal robot gladiators. As the spies try to thwart her strange operation, they find themselves fighting for their lives against the princess' latest toy - Magnaglad, a super-sized robot gladiator! In a b-story, Alex and Sam find Clover's diary - and read it.