Sonic, Tails, Cream, Cheese, and Chris discover that a Chaos Emerald is in the Ocean of a Motel, so they go on a vacation try to find a Chaos Emerald in the deep Ocean but it turns out that Eggman is under the sea, and ready to attack, trying to get the Chaos Emerald too.
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Ready to Watch Sonic X, Season 1, Episode 16?