Two young brothers secretly bring home a seal from their summer vacation and try to hide it from Mom and Dad. Havoc ensues as Sammy's antics disrupt the quiet town of Gatesville and its unsuspecting residents.
Michael McGreevey
as Arthur Loomis
Bill Mumy
as Petey Loomis
Jack Carson
as Harold Sylvester
Robert Culp
as Chester 'Chet' Loomis
Ann Jillian
as Porsche 'Rocky' Sylvester
Patricia Barry
as Helen Loomis
Elisabeth Fraser
as Lovey Sylvester
Renie Riano
as Mrs. Crotty
Mary Mitchel
as Sue Foster
Claude Stroud
as Ben
Bill Baldwin
as Party Guest (uncredited)
Benjie Bancroft
as Party Guest (uncredited)
