The Lost Continent (1968)

An eclectic group of characters set sail on Captain Lansen’s leaky cargo ship in an attempt to escape their various troubles. When a violent storm strikes, the ship is swept into the Sargasso Sea and the passengers find themselves trapped on an island populated by man-eating seaweed, giant crabs and Spanish conquistadors who believe it’s still the 16th century.
Michael Carreras, Doreen Soan
Eric Porter, Hildegard Knef, Suzanna Leigh, Tony Beckley, Jimmy Hanley, James Cossins, Reg Lye, Ben Carruthers, Nigel Stock, Neil McCallum, Donald Sumpter, Victor Maddern, Michael Ripper, Dana Gillespie, Darryl Read, Eddie Powell
tt0063240