Tom Hanks plays Allen Bauer, a man who falls in love with a mysterious woman who is actually a mermaid.
Eugene Levy brings Walter Kornbluth to life, a scientist who becomes obsessed with proving the existence of mermaids.
John Candy takes on the role of Freddie Bauer, Allen's boisterous and supportive brother.
Dody Goodman plays Mrs. Stimler, a quirky character who adds humor to the story.
Shecky Greene portrays Mr. Buyrite, a businessman who gets caught up in the mermaid's secret.
Richard B. Shull plays Dr. Ross, a doctor who gets involved in the mermaid's mysterious situation.
Bobby Di Cicco takes on the role of Jerry, a friend of Allen who gets entangled in the mermaid's world.
Howard Morris plays Dr. Zidell, a character involved in the scientific exploration of mermaids.
Tony DiBenedetto portrays Tim, the Doorman who witnesses the mermaid's unusual behavior.
Patrick Cronin plays Michaelson, a character who encounters the mermaid's presence.
Charles Walker portrays Michaelson's Partner, a character who also becomes involved in the mermaid's mystery.
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