The animals wake to discover that a leprechaun has stolen the Farmer's entire St. Patrick's Day potato crop! As they try to catch the Irish stereotype, the leprechaun uses his magic and turns the animals into shamrocks!
When Mr. Beady's mother, Mother Beady, shows up for an unexpected visit, Mrs. Beady decides to stay with a friend. Mrs. Beady soon realizes that she doesn't have any friends and makes a truce with the animals so she can stay with them.
When Peck is pummeled to bits at the Science Fair by one of the kid animals' projects, the animals make him bionic.Duke learns out that his kid sister, Stamps, has become engaged to his arch-enemy Baxter!
While creating a fake alien news story to scare away Mrs. Beady, Otis accidentally attracts actual space aliens bent on conquering Earth! Otis tries to stall them at the barnyard while he tries to find their weakness.
When a beautiful she-donkey takes an interest in Pip, Bessy suspects ulterior motives and follows them on their dates./An evil scientist threatens to mass-market the animals' adorable mini-clones as pets!