From season 1 of The Monkees:
The guys are chillin' on the beach when they're recruited by a director (Jerry Lester) to be extras for a beach movie starring Frankie Catalina (Bobby Sherman). However, Catalina's success has gone to his head, so the Monkees decide to chop his ego down to size.
Here's "Monkees at the Movies":
The version of "Valleri" heard here was the original studio track, not the eventual hit single.
Bobby Sherman, of course, would stick with Screen Gems for 2 series of his own, Here Come The Brides and Getting Together, while forging his own career on the charts.