Jazz, the new cat in town (known as "A.T." – All That), takes over the pool hall, steals Top Cat's girlfriend, sways the gang and cleans up the alley. This sparks a contest between the pair. However, when both Jazz and Top Cat are offered a part in a Hollywood film, they assume that it is another trick. The offer turns out to be legitimate, and Benny is cast in the starring role in The Thing from the Alley. He leaves for Hollywood in a limo, accompanied by Top Cat and the gang in the guise of Benny's manager, valet, vocal coach, tailor and chauffeur. After that, Officer Dibble catches Jazz using the police phone, now declaring that Jazz "is just as bad as Top Cat". Jazz and his buddy Beau are forced to keep the alley clean for 30 days.

Mr. Gutenberg, the musical director of Carnegie Hall (voiced by John Stephenson), mistakes a recording of violin virtuoso Laszlo Laszlo for the playing of Benny the Ball, who has just taken up the instrument. He approaches Benny with an offer to perform and Top Cat negotiates a deal for $50,000 for a Saturday night performance at the Hall—an offer that is withdrawn when Carnegie's Board of Directors really hear Benny play. When Gutenberg offers a $10,000 reward to find the true violinist, the gang discovers that it's their neighborhood street cleaner, Laszlo Laszlo (voiced by Leo De Lyon). John Stephenson provides the voices of Mr. Gutenberg, paramedic, his assistant Ralph, and the record store owner, while Leo De Lyon does the voice of Lazlo Lazlo.