- "You're my favorite customer."
- —Stacey Carosi
Stacey Carosi is introduced in the Malibu Sands Beach Club episodes, where everyone in the group, except for Lisa (who is a guest there), takes a summer job.
Eastern tough girl. Daddy's girl .
Stacey is on summer break from attending school on the East Coast, and her father, Leon Carosi, is the owner of the club. Stacey is initially disgusted by Zack's West Coast lifestyle and refers to him sarcastically as "Dude", but they later develop romantic feelings for each other. They must hide their relationship from Leon, as Zack and Leon are at odds from the beginning of the summer. Their relationship ends when Stacey returns to New York for school. In the final summer episode, however, Leon learns about the romance, and still finds himself liking Zack.