Perfect Storms (2013)

S7E35 Shellback Shenanigans

Plankton decides to disguise himself as Gary in a sneaky attempt to swipe the secret formula. He believes that by taking on the appearance of SpongeBob’s beloved pet snail, he can fool everyone and finally get his hands on the Krabby Patty recipe. As the plan unfolds, chaos ensues, and SpongeBob grows suspicious of Gary's unusual behavior, leading to a series of comical misunderstandings.