Plankton's Old Chum

"Oh, boy! Chum Day. A brand new holiday!"

- SpongeBob

"Plankton's Old Chum" is the first segment of the fifth episode of season 12, and it is paired with "Stormy Weather." In this episode, SpongeBob helps Plankton dump his rotten chum all over the city, which leads to the creation of a new holiday.

Characters

 * SpongeBob SquarePants
 * Sheldon J. Plankton
 * Patrick Star
 * Gary the Snail
 * Squidward Tentacles
 * Karen Plankton
 * Mrs. Puff
 * Eugene H. Krabs

Plot
Plankton takes the barrel of rotten chum to his usual hiding place after it becomes rotten, but there's not enough space in there to dump all the chum. He goes to a nearby wishing well filled with chum and wishes for the well to be empty, but it doesn't work at first and he leaves right before his wish comes true.

Plankton finds a hole in the fence at a Snail Park and pushes his hose through the hole into SpongeBob's holes, and when he shoots, SpongeBob causes chum to spread all over the park. After that, SpongeBob realizes there's chum in his body, to which Plankton tells him it is actually a gift called New Chum for Chuam Day.

Plankton promises to tell him all about it if he helps him hide all the chum, so they spread the chum in everyone's houses. The next morning, all but one scoop of chum is left, so SpongeBob tries to hide it in the sewer, but ends up having a struggle. After pushing too hard, he causes all the chum to shoot out into the air and cause chum to start raining down.

Everyone realizes that rotten chum has spread through town and tries to punish Plankton for it, but SpongeBob reminds them that it is Chum Day, but can't convince them, even after showing several things about the holiday. They stop getting angry after seeing children celebrating Chum Day, and all the citizens start celebrating it.

At the same time, the health inspector comes to Plankton to ask him if he's responsible for the chum, and after replying with yes, tells him he has to pay the fine for chum dumping or eat all the chum, so he picks the second option.