A misguided scientist enables an alien from Venus named Zontar to come to earth in order to "help solve man's problems". However, as soon as Zontar arrives on Earth, it quickly becomes obvious that the three-eyed, bat-winged, skeletal black creature has a hidden agenda.

Aliens, contacting scientist Adam Penner, inform him that they have been on the moon for twenty thousand years, undetected due to their invisibility, and have now decided to annihilate humanity unless all the nations of earth surrender immediately. Sequestered in an impregnable laboratory trying to find the aliens' weakness, Penner, his daughter, a no-nonsense army major and a squeamish scientist are attacked from outside by the aliens, who have occupied the bodies of the recently deceased.

Preacher Sam Stone and his new beautiful wife Jill stand by the grave of Sheriff Billy Kelly, who died trying to bring law-and-order to Emporia, Wyoming. Among the mourners are businessman George Gates, mayor Ned West and his daughter Patricia. The mayor rejects Gates' suggestion that he release gunfighter Waco from jail to clean up the town. When Patricia is attacked by a cowboy after leaving her boyfriend Scotty Moore, the mayor finally decides it is time accept the governor;s offer of amnesty for Waco. Jill Stone's first reaction, when learning that Waco has been released, is to leave town before Waco finds out that she, his former fiancée, has married the town preacher while Waco was in jail. Town boss Joe Gore is not overjoyed, either, but Ike and Pete Jenner eagerly await the chance to shoot Waco for the death of their brother. Written by Les Adams

Communists blackmail a shipping executive into spying for them.

American engineer Steve Corey comes to Mexico to work at one of the mining projects owned by Katherine Beckman and her half-brother Paul. He meets Katherine, and the man he is replacing, Bill Maxton, tells him that Katherine is his for the asking..."all you have to do is touch her---she goes off like fireworks. There were plenty of guys before me, and there'll be plenty after me." Steve finds Katherine as advertised but he falls in love with her. Once he sees that the romance is for real, brother Paul is more than a little displeased at this turn of events and brings back one of Katherine's earlier flames, Gus Cole, to tempt Katherine away from Steve.

The townsfolk are set on lynching an accused killer held in the town lockup. But US Marshal Johnny Reno stands in their way.

A young woman discovers she is the daughter of the infamous Dr. Jekyll, and begins to believe that she may also have a split personality, one of whom is a ruthless killer.

An American cavalry brigade is sent to occupy a small Filipino village in 1902 and quell guerilla resistance in the surrounding jungle. Working with the people to build roads, schools, and bridges, they prove that the most important thing an army can have is "good will and integrity."