Mystery On Monster Island (1980)

After cannibalizing Jules Verne's Journey to the Center of the Earth in his 1977 film Where Time Began, Spanish director Juan Piquer Simon returned to the author with this substandard retelling of Mysterious Island. The story concerns a shipwrecked group who discover natural wonders and a gold treasure on a dangerous island populated by dinosaurs and living seaweed. Terence Stamp is the bad guy. Supposedly the most expensive film made in Spain to that point, it has an admittedly strong genre cast including Peter Cushing, Paul Naschy, and Ian Sera, but is really a cheesy monster movie likely to appeal only to children too young to be critical of special effects.