Who Is What?

Immediately after getting married, Mark and Stacy Singleton leave for their honeymoon in the Caribbean. They rent a boat to cruise some of the islands, but while they are sleeping, a large tanker unknowingly overturns their craft. Holding on to wreckage, they float toward a nearby island where two men-one a scientist and the other his assistant-rescue them. Mark and Stacy don't know it, but their life has just become much more complicated than they could ever have imagined....