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The Super Mario Bros. Super Show!
“I've never been so insulted in my whole life!”
A single worm first appeared in the The Super Mario Bros. Super Show! episode "The Bird! The Bird!". After the Mario Bros. defeated Bowser and saved their new friend Cheepy and his mother, they were invited over to Cheepy's house for dinner as thanks for their help, however they were unaware that the dinner was actually a large, talking, grumpy worm, after seeing it they ran out of the house.
Super Mario Bros. film
WarioWare, Inc.: Mega Microgame$!
In WarioWare, Inc.: Mega Microgame$!, one of the playable microgames in the Nature folder is known as Worm Squirm where the player has to find out which worm is the one under the player's control and guide it towards the water.
Super Mario Galaxy
In Super Mario Galaxy, a giant, friendly, green worm appeared in the Gusty Garden Galaxy, where it snacks on some giant apple planetoids. Mario can use this worm to cross between the three apple planetoids in the area by Ground Pounding Stumps in the planetoids, causing the worm to burrow through one apple and into the next.