Kimba the White Lion

A Friend In Deed (1x44)

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Roger Ranger is taken captive by the elephants when he asks them for passage through their graveyard to get to a place known as Rainbow Valley. If Kimba wants him back, he and a few other animals must swim in a swamp, where if you stop moving you'll drown, for 10 days without stopping for anything. While doing this, Kimba recaps the events of how he first met Roger Ranger long ago.