The sixth Hanna-Barbera syndicated cartoon after their departure from MGM starred Peter Potamus (a purple hippopotamus), and his traveling companion So-So (a monkey), who fly back and forth through time in a balloon participating in historic events. Whenever they get into serious enough trouble, as they do in every episode, Peter defeats his enemies with his trademark "Hippo Hurricane Hollar." Other cartoon shorts include, "Breezly and Sneely," and "Yippee, Yappee, and Yahooey."
Thanks to a thunderstorm, Peter Potamus and So-So arrive in the land of the giants, where they encounter a giant who is waiting for Jack to arrive to capture him.
Peter Potamus is captured by Romans and forced to fight with the lions in the Coliseum.
In Ancient Egypt, Peter Potamus agrees to help Caesar conquer the heart of Cleopatra.
Peter Potamus and So-So are hired by the king to stop the fire-breathing dragon that has been terrorizing the town.
Peter Potamus and So-So fly over a caravan of wagons that are headed for Hollywood but first they must get past the Indians.
Peter Potamus lands on Captain Kidd's ship, the Bounty, just as his crew deserts him. The Captain recruits Peter as his new crew, against Peter's wishes.
Peter Potamus lands in Sherwood Forest and meets Robin Hood.
Peter Potamus and So-So land on Mars and a movie director asks Peter to star in his new movie.
Peter Potamus gets locked inside a haunted mansion and gets chased by a ghost.
Peter Potamus is mistaken for an island god known as Omega by the native island people and must pass a few tests to prove himself.
Peter Potamus lands in between an ongoing feud between Zeke Quagmire and Maudie Scrag.
Peter Potamus meets Little Red Riding Hood and tries to protect her from the wolf.
Peter Potamus and So-So find an uninhabited island and find a pirate trying to bury his treasure.
Peter Potamus and So-So end up in the days of King Arthur.