Birthday World is the fourth episode of The Wacky Adventures of Ronald McDonald.
Hamburglar's present to Ronald on his birthday turns into a wacky adventure when the gang visits Birthday World, an amusement park run by a mad scientist who wants to turn the whole world into babies! Will the gang thwart his plans, or stay babies forever? - Klasky Csupo
It's Ronald's birthday, but Hamburglar was upset that he did not get Ronald a present. Ronald and his gang go to a fake amusement park known as "Birthday World", only to find out that it was run by an evil mad scientist named Professor Pinchworm.