Shogun Island

Trainer Samurai SpongeBob is waxing Gary when the local mailman shows up at SpongeBob's house and hands him a videotape delivery. SpongeBob plays the tape on his TV, which states that he has been recieved to be "Shogun" and tells him to attend to Iwo Jima to be crowned.

SpongeBob is about to leave when he encounters Ronin Sandy, to whom he happily explains that he is the going to be shogun. Sandy is suspicious of this, so she accompanies SpongeBob on the boat ride. The boat stops at Shogun Island, where the "Supreme Shogun" Hirohito, greets SpongeBob but ignores Sandy. SpongeBob, to prove himself, asks to fight Hirohito's best warrior. Three warriors arrive, and when they fight SpongeBob, they pretend to get hurt and soon pretend to be defeated.

Sandy notices this, adding to her suspicion. SpongeBob is officially crowned a "Shogun" and sits on his throne and requests Sandy to sit beside him in a lounge chair. Sandy leaves when SpongeBob becomes arrogantly proud and accuses her of being jealous of him. After she leaves, SpongeBob is suddenly locked into his throne. Just as the water is up to Sandy's head (she was walking into the water about to leave), she hears SpongeBob's cries for help, and reluctantly goes back to save him.

Sandy fights through Hirohito's Castle, fighting an opponent on each floor with an unusual "power" (there are three floors that Sandy has to get through and for all of them, she had to avoid being tickled, kissed and smelling the filth of Hirohito's COs by using jelly filled donuts, hair dryer and fresh air dome in her helmet) until she crashes through the top floor's entry way; the trapdoor where SpongeBob is being held hostage by Hirohito. Hirohito reveals that he is a debt collector, the island was originally for battle royale, and will not let SpongeBob go until he agrees to buy a debt on the island, while also increasing his equity. He then tells SpongeBob he is not shogun as it was just a scam. SpongeBob shouts in horror and Sandy want to fight Hirohito. Hirohito rips off his uniform to expose him naked after a brief muscle growth (Hirohito's extra muscles were in his eyebrows), and so they begin fighting by charging at each other but they miss and Sandy kill Hirohito by beheading, chop his torso halves and amputated his limbs. She frees SpongeBob. As they leave the island, SpongeBob apologizes to Sandy for acting like a jerk to her and thanks her for saving him from buying debt, and which she forgives him and tells him that's what friends are for. Then SpongeBob asked if he's not into shogunate anymore, Sandy said "Fuck off". Then she explains to him about debt and royale as the boat leaves shore.