The Wheel Thing

"The Wheel Thing" is the second episode in the Super Mario World animated television series.

Plot
While relaxing in front of Dome Castle, Mario and Luigi observe the cavepeople of Dome City painstakingly lift and transport several rocks and boulders. Feeling sorry for the people, Luigi and Mario decide to think of a way to help them. After some light brainstorming, Mario comes up with an idea.

Inside the Dome Castle, Mario and Luigi are hard at work producing multiple wooden wheels, as Kooky von Koopa watches unbeknownst to anyone inside. After receiving an idea for his next evil creation, he runs off as the plumbers proceed to transport their constructed wheels outside to share with the residents of Dome City. Almost immediately, Mario spots two Ogga and Agga reluctantly carrying a crate of heavy wooden objects and stones, and hands two wheels over to the hard workers. Not understanding what to do with the wheels, wear them on their heads instead, much to Mario's dismay.

Animation errors

 * When Luigi asks Mario, "Does that mean what I 'tink' it means?" in the Lava Pits, Mario's overalls and shirt are red.
 * When Luigi first shows Yoshi some wheels, the latter's arms are white. Also, there are multiple shots in the episode where the 'L' on Luigi's cap is white on a black background.
 * Yoshi's eyes vary in size throughout the episode.
 * Unlike the previous show, Kooky's snout is the same color as the rest of his body.
 * When Princess Peach asks Mario, "It even has a horn?", her eyebrows are a different color.
 * When Mario hits the Question Blocks, there are five, with the fourth one containing a Cape Feather. However, when Mario hits the block with the feather, there are six blocks instead.
 * After the cave people put their wheels on their heads, Mario has an 'L' on his cap.
 * When Mario tosses the fireball from the Fire Flower Luigi gives him, he shouts "Auuggh!" with King Koopa's voice.

Trivia

 * Due to King Koopa not appearing in the previous episode, "Fire Sale", this is his first appearance in the Super Mario World series.
 * This is the only episode of Super Mario World where Kooky has a speaking role.