Dr. Steven Sorenson plans to tap the geothermal energy of the Earth's interior by means of a thermonuclear device detonated deep within the Earth. This experiment causes a crack to form and grow within the Earth's crust, which threatens to split the earth in two if it is not stopped in time.

Set during the Allied invasion of the island of Guadalcanal in the Pacific theater during WWII, this film is based on the novel by James Jones. Keir Dullea is Private Doll, who dreads the invasion and steals a pistol to help him protect himself. Sergeant Welsh (Jack Warden), a caustic, battle-scarred veteran, hates Doll, whom he considers a coward. In battle, Doll kills a Japanese soldier and is filled with remorse, which further angers the sergeant. The next day, an emboldened Doll wipes out an entire enemy machine gun post and begins to feel as sadistic as Welsh. The two must work together to clear away some mines, but as they do, their platoon is surprised by a Japanese raid.

In this western, a gambler wins a big Mexican ranch and decides to herd all of the cattle upon it into Texas. The crook enlists the aide of a few Mexicans, but they don't realize he plans to cheat them. En route, the cattle drivers are ambushed by banditos. They survive, but during the course of the struggle, the cattle hands learn the truth and ensure that justice gets served.