Judging by an overview of British kiddie-matinee films, one of the most popular plot lines is the "rescue at sea" gimmick. Usually, the rescuee is stranded on a tiny island, threatened by the incoming tide. Sometimes this occurs in the Channel Islands; in The Big Catch, the locale is a flyspeck isle off the coast of Scotland. The rescuers in this instance are a band of courageous Scottish children, who rush in where grownups fear to tread. At 55 minutes, The Big Catch was eminently suitable for Saturday morning exposure on American television.