"The Prince & the Plunger" is the sixth episode of the first season of The Suite Life of Zack & Cody. Carey discovers she has a "secret admirer". When Zack and Cody go to see Arwin, they discover that he is the "secret admirer" of Carey, because he was with all the poems, and the flowers. But Carey thinks her secret admirer was Serge, the concierge. Meanwhile, Mr. Moseby has to convince London to go to the Father-Daughter Dance.
Carey receives flowers and a poem from a secret admirer. Zack, Cody, and Maddie believe it is the new employee—Serge the concierge-he admits to sending the gifts. However, Serge is a bit of a jerk and treats the boys like they're babies. While their mom is out on her date, they discover that Arwin is infatuated with Carey, and was the one who wrote the poem and sent the flowers. The boys and Maddie work to clean Arwin up, and to expose Serge as a pretender. Ultimately, Carey lets Arwin down gently, dumps Serge, and the boys dump llama milk on his head.
Mr. Moseby is excited that Mr. Tipton is coming to visit the hotel and to take London to the Father-Daughter Dance at London's school. London, however, is convinced that he won't show as usual. After Moseby gets the hotel in perfect condition and hires a band to welcome his boss, he learns that Mr. Tipton is a no-show (as London predicted), and the pilot brings London a diamond necklace as an apology. Moseby discovers London crying in the linen closet; her tough attitude about her father once again disappointing her is revealed to be a front. Moseby asks London if she would like him to be her escort to the Father-Daughter Dance. She agrees, looks him up and down and says, "You're gonna change, right?"
- The title of this episode, "The Prince & The Plunger", is an allusion to the novel, The Prince and the Pauper.
- Coincidentally, Dylan and Cole Sprouse later starred in a modernization of The Prince and the Pauper in 2007.
- This is the first appearance of Arwin.