This joke appears in several episodes, including Segment 2 of The Phantom Creeps from Experiment #205 Rocket Attack USA, Gamera, Catalina Caper, and Wild Rebels. It was usually made when a newspaper appeared on screen.
It refers to a long-running advertisement in the show business newspaper Variety for the film Chief Zabu, a comedy about a group of real estate developers who attempt to take over a Polynesian nation. Actor Zack Norman co-wrote the film under the pseudonym Howard Zuker. The riff is phrased slightly differently than the ad, which reads "Zack Norman AS Sammy in 'Chief Zabu'."
The film was shot in 1986 but went unreleased until 2016. The advertisement in Variety was an attempt to promote interest in the film and secure a distributor.