Sea Serpent, The (1984)

aka: Serpiente De Mar

A nuclear detonation in the Atlantic re-animates a prehistoric sea monster. The creature terrorizes the Spanish coastline, attacking swimmers, boats and lighthouses without mercy. A sea captain (Timothy Bottoms) whose ship was sunk by the monster and an American tourist (Taryn Power) whose best friend was killed by the beast, team up to stop the monster, along with the help of a respected oceanographer (Ray Milland).

This was Ray Milland's last screen appearance. He died of lung cancer on March 10, 1986. He was 81.