Promoter William Montague wants to buy the estate owned by the Daceys, Mrs. Dacey and her daughter Ena and son Todd, in order to build a resort hotel. When they turn him down, he produces a couple of distant relatives, Janice and Robert Clayton, and sets about to prove that the estate rightfully belongs to them. The identity of the rightful heirs is thought to be buried in a sunken ship off of the Jamaican shore and the search begins, led by a schooner skipper, Patrick Fairlie, who is in love with Ena.

After having been recently shipwrecked, a group of survivors begin dealing with both the reality of being stranded on a remote island as well as with feelings of alienation and isolation. Adapted from the novel by Johann Wyss, this was the pilot episode for a proposed television series co-produced by Edgar G. Ulmer and Louis Hayward. Filmed in Mexico in 1957 and bearing a 1958 copyright, Swiss Family Robinson: Lost in the Jungle was not "released" until 2000, when it was included as an extra feature on the DVD version of Ulmer's The Pirates of Capri.

Shipwreck survivors land on an uncharted island inhabited by prehistoric beasts.