"The Kidney of the Sea" is the fourth episode of The Suite Life on Deck.
Zack has a crush on a cute passenger named Violet, but must deal with her wealthy "boyfriend", Ashton, and snooty mother who will do anything to keep Zack and Violet apart, especially after Ashton gives her an expensive jewelry piece. Meanwhile, Cody referees an intelligence test between London's dog, Ivana, and Bailey's pet pig, Porkers. Bailey tries to take advantage of Cody's crush and London tries to bribe Cody. At the end, the competition ends in a draw. Ashton accuses Zack of stealing the "Kidney of the Sea" necklace. London's dog, Ivana, proves Ashton wrong. Ashton had hidden the jewel in his pocket and then he admits the truth in a grudging tone.
- Christa B. Allen as Violet, Shannon Holt as Mrs. Berg, Aaron Perilo as Ashton