Early 20th-century adventurers find themselves fighting for survival after their hot-air balloon crashes into a remote part of the Amazon, stranding them on a prehistoric plateau.

When mankind beams a radio signal into space, a reply comes from ‘Planet G’, in the form of several alien crafts that splash down in the waters off Hawaii. Lieutenant Alex Hopper is a weapons officer assigned to the USS John Paul Jones, part of an international naval coalition which becomes the world's last hope for survival as they engage the hostile alien force of unimaginable strength. While taking on the invaders, Hopper must also try to live up to the potential that his brother, and his fiancée's father—an Admiral—expect of him.

Marine biologist Jack Ellway and his son Brandon are drawn to the Polynesian island of Malau to study the effects of recent seismic activity on the area's marine life. Along with the local doctor Alyson Hart, they soon become caught up in the investigation of a series of recent drownings with unexpected results. As Jack explores the surrounding ocean for a mysterious marine creature, Brandon discovers and befriends a three-foot-long baby creature that is able to leave the ocean and walk on land. As more dangerous and giant creatures come onto the island, and the military begins to take offensive action, Jack must risk everything to save the creatures, the island and his son.

In the final film in the Chameleon trilogy, the genetically-engineered agent Kam must thwart the plans of her evil twin brother.

A debt-ridden night club owner has to take on Italian and Asian mobsters, corrupt police, and an angry pimp that he threw out of the club to try to keep his club in business.