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Gladiator Oggy is the fourth episode of Season 5 and the 273rd episode overall. It takes place in Ancient Rome.
Oggy and Olivia go to the Coliseum to watch a gladiator combat. The roaches filch Oggy's popcorn. He goes after them but ends up being enlisted as a gladiator! The roaches, propelled into the arena themselves, bitterly regret nicking Oggy's popcorn...