Four cast members from the 1970s comedy Happy Days — Anson Williams, Don Most, Marion Ross and Erin Moran — as well as the estate of the late Tom Bosley, today filed a $10 million breach-of-contract lawsuit against CBS, which owns the classic sitcom, over unpaid merchandising revenue. The actors claim that they should’ve been paid more under their contracts for the use of their likenesses on  comic books, T-shirts, scrapbooks, trading cards, games, lunch boxes, dolls, toy cars, magnets, greeting cards, DVD covers and especially casino slot machines. “We agree that funds are owed to the actors and have been working with them for quite some time to resolve the issue,” CBS said in a statement to CNN.

Conspicuously missing from the complaint are the best-known Happy Days cast members: Henry Winkler, aka the Fonz; Ron Howard (Richie Cunningham); and Scott Baio (Chachi Arcola). Jon Pfeiffer, the attorney representing the Happy Days actors in the case, told The Washington Post that Winkler appears to have been properly compensated, and Baio’s likeness has not been used in merchandising to the same degree as the others. “I have not spoken to Ron Howard, but we will learn through discovery whether he has been paid,” Pfeiffer said.