It was laundry day for SpongeBob SquarePants. He gathered all of his dirty clothes and tossed hem into a big pile. SpongeBob loved laundry day and everything gets cleaned, including the shell on Gary's back. SpongeBob scooped up his clothes and dumped them into the washing machine. Now SpongeBob would finish the day's chores. He waved the dishes, vacuumed the floor, and dusted the furniture. Then SpongeBob put his clothes in the dryer, just as Patrick called on the phone. On the phone, Patrick asks SpongeBob how long can he make this sound. Before SpongeBob could reply, Patrick began to yodel loudly into the phone. An hour later Patrick was still yodeling. SpongeBob tried to interrupt him, but it was no use. Once Patrick started yodeling, there was no stopping him. SpongeBob looked at the clock. His clothes were probably dry by now. He whispered to Gary to check the laundry. Gary inched his way into the laundry room. He opened the dryer and took out his shell and still warm. Gary was so happy to have his shell back that he forgot all about SpongeBob's clothes. When SpongeBob finally got off the phone, he hurried to check on the laundry. He was shocked to see that his clothes were still in the dryer. He stopped the machine and took out his pants only to find they had shrunk! He now had to find new pants. Later that day, SpongeBob went to shop for pants. But when he walked into his favorite store, Nautical Knickers, he got some bad news. The store clerk told SpongeBob that they were out of square pants and the store wouldn't be getting another shipment for months. SpongeBob had to find a different style to meet his needs. SpongeBob tried on all kinds of pants, but he couldn't find anything that he liked. The pants were either too long, too wide, or just plain weird. SpongeBob was about to give up when he found a pair of pants that were almost too good to be true. He tried them on and they were a perfect fit.
A short while later SpongeBob left the store wearing his new pants. On his way home he saw Patrick. SpongeBob asked Patrick if he noticed anything different. Patrick said he didn't know who was talking to him. SpongeBob told Patrick his name to remind of who he was. Patrick looked at a drawing of SpongeBob on his hand. Patrick thought SpongeBob was still a mysterious stranger because he wasn't wearing square pants and walked away. SpongeBob couldn't believe it. It's just a new pants and it's not like SpongeBob's friends won't recognize him. At that moment Sandy walked by. Sandy said she didn't recognize this stranger in those newfangled dungarees. SpongeBob was shocked that Sandy recognize him either! The pants really made him look like a different person. SpongeBob kept walking. He was almost home when he spotted Squidward. SpongeBob thought Squidward would recognize him. SpongeBob said "Hi" to Squidward, but was pretending not to recognize SpongeBob so he wouldn't have to talk to him. But SpongeBob believed that Squidward really didn't know who he was. SpongeBob walked away feeling a little sad. I guess I'm not SpongeBob SquarePants anymore, he thought. I'll have to start all over again. SpongeBob wandered around for a while, not sure what to do. Hours later he spotted the Krusty Krab, which cheered him up immediately. SpongeBob happily headed towards the restaurant. When SpongeBob arrived at the Krusty Krab, he marched straight to the cashier's counter. SpongeBob said Squidward at the cashier that his name was "SpongeBob RoundPants" and he would like to apply for a position at the fine eating establishment. Squidward nearly fell over. His plan to pretend not to know SpongeBob hadn't worked. SpongeBob was back to pester him! Squidward had no choice but to play along. He handed SpongeBob a job application. As SpongeBob filled it out, Mr. Krabs walked in and asked what was going on. SpongeBob says he filling out an application, but Mr. Krabs order him to work immediately. SpongeBob couldn't wait to start his job. He put on his Krusty Krab hat and turned to Squidward. He lead SpongeBob around the restaurant showing him what to do. In no time SpongeBob learned how Squidward did his job and picked up all of his bad habits. Later on, SpongeBob did his job just the way Squidward has shown him. He was rude to the customers, he turned Krabby Patties, and he kept going to the bathroom. Squidward was proud of him. When Mr. Krabs walked into the restaurant, he was shocked to see a long line of angry customers along with both SpongeBob and Squidward asleep at the register. Mr. Krabs told SpongeBob that he's used to Squidward sleeping on the job, but he expects more from Mr. SquarePants. SpongeBob explained to Mr. Krabs that he's not a SquarePants with RoundPants. Mr. Krabs suggested that SpongeBob should take off the pants. Moments later SpongeBob came out of the kitchen in his underpants and was happy to be SpongeBob SquarePants again, serving regular delicious Krabby Patties with a smile. Just then Sandy walked into the Krusty Krab and notices SpongeBob right away. Sandy saw what SpongeBob had on and called him "SpongeBob UnderPants." SpongeBob screamed. It had been bad enough being SpongeBob RoundPants. Now he'd have to start all over again as SpongeBob UnderPants!