The story itself serves as a crossover between SpongeBob SquarePants and Mitchell Van Morgan. This crossover takes place after the events of SpongeBob SquarePants and Mitchell Van Morgan itself. While Gavin is attempting to fix a hole in his Laboratory, Gavin trips himself and Gavie saw something strange is going on at the pacific coast by watching the Orange County News on monitor. Later, a strange mysterious light glowing in the pacific ocean containing the SpongeBob SquarePants world, causing the Bikini bottom residents within it to spread across the city of Raleighopolis. Afterwards, Doctor Marquessa combines his evil Marquessanik robot army with that of SpongeBob's arch-nemesis, Sheldon D. Plankton, and they kidnap Carolyn and Sandy Cheeks. Mitchell & Gavin must now team up with SpongeBob & Patrick to set everything right, defeat both Doctor Marquessa & Plankton, and bring all the SpongeBob fish people back into SpongeBob's Bikini Bottom world.
