The Wacky Adventures of Ronald McDonald Birthday World (2001)

Its Ronalds birthday and Hamburglar upset that he didnt get Ronald a present invites everyone to a fake amusement park known as Birthday World to celebrate run by an evil mad scientist named Professor Thaddeus J Pinchworm Everyone is amused at first but they can no longer escape and no longer fall for the poor designs of the rides until they ride a rollercoaster which turns them into babies both Franklin and Tika are wearing diapers and they need to find out how to return to their original ages even though their certain abilities are limited since they are toddlers