Ten years after the end of the war in Vietnam, four ex-Marines decide to return to S.E. Asia to investigate reports of American POWs still being held there. These four include Roger, whose daughter's just been married, the unemployed James, Mark, who's quit his job at an Arizona roadside tavern, and Richard, recently a patient at a mental hospital. In the jungles of S.E. Asia they discover American POWs but also find out about a U.S. Government plot to keep this knowledge a secret.

Indian sheriff Thunder is transferred to a small town in the desert. He learns that the corrupt deputy is paid by the drug mob. To protect himself, the deputy sets a trap for Thunder and gets him convicted as dealer. Thunder manages to break out of the brutal prison camp and takes bloody revenge. However he cannot sufficiently protect his pregnant wife.

The Caribbean swamps which is to be made into a holiday resort is terrorized again by a second monstrous crocodile which is killing off anyone unfortunate to be on the water.

They took his wife... but he's still Walking Tall, they drew First Blood, but he's gonna fight back like Billy Jack.

Anthony is in the Phillipines visiting his father. He inadvertently interferes with the affairs of local gangster Quino, who also happens to be a champion Karate fighter. After embarrassing Quino near a local tournament, Anthony is beaten up and left for dead. An old monk nurses Anthony back to health and teaches him the ways of martial arts so he may go back and fight Quino again.

A group of environmentalists arrives at a faraway tropical delta where toxic waste is being dumped. However the water also hides a giant crocodile. The corrupt local officials don't help much either.