This third film in the series follows a group of marine biologists attempting to capture a young great white shark that has wandered into Florida's Sea World Park. However, later it is discovered that the shark's 35-foot mother is also a guest at Sea World. What follows is the shark wreaking havoc on the visitors in the park.
Chaos ensues when two former college friends, one a housewife and the other the editor of a hip women's magazine, decide to swap lifestyles between them.
Mobster Foots Pulardos, who operates a health gym as a front, plans to flee to Mexico to evade government tax officials. His girl friend, Sugar Pye, suggests that he first arrange for the cremation of a man having his own peculiar identifying characteristic--feet of different sizes--and then apply for a Diners' Club card for use in paying his fare. The request for the credit card comes to the desk of Ernie Klenk, a timid clerk. Nervous about his forthcoming marriage to the boss's secretary, Lucy, Ernie inadvertently okays the application, then, discovering his mistake, rushes to the health gym to recover the club card he has issued.
