Mr. Lucky is an honest professional gambler with extraordinary luck. He carries a pocket watch whose chimes play the first five notes of the "Mr. Lucky" theme music. He and Andamo operate a floating casino aboard a luxury yacht anchored outside an American port city. (The yacht in reality was the "Alamo", a 148-foot yacht owned by former Compton, California mayor Col. C.S. Smith, publisher of the now-defunct Herald American Newspaper chain.) Their business brings them into contact with numerous criminals and people hiding from criminals. This continues even after Lucky changes their business to a floating restaurant (see "Format change" below).