Jungle Taitei - episode 44 - 02 Aug, 1966

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. (Source: IMDb)