Experiment Alcatraz

In 1973, the first manned expedition to Mars is marooned; by the time a rescue mission arrives, there is only one survivor: the leader, Col. Edward Carruthers, who appears to have murdered the others! According to Carruthers, an unknown life form killed his comrades during a sandstorm. But the skeptical rescuers little suspect that "it" has stowed away for the voyage back to Earth...

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.

An undercover U.S. agent (Gene Barry) searches for an Arab ruler's son kidnapped by communists in Hong Kong.

The police use a gangster's son to get to him.

A Treasury agent (Donald Cook) gains the trust of a mob gunman while working under cover to smash a crime syndicate.

Love-starved gun molls (Carole Mathews, Beverly Michaels) escape from a prison farm where matrons make their lives miserable.

A TV star meets with opposition from adults who object to the opening of a rock 'n' roll palace for teens.

Laura Mansfield catches a glimpse of mob hit man Jackie Wales after he shoots her businessman father. At the police station, Laura identifies Jackie as the murderer, but the policeman in charge of the case, Lt. Brewster, lets him go, citing a lack of corroborating evidence. Outraged, Laura worms her way into the unsuspecting Jackie's heart, trying to snare him and mob-connected club owner Armitage in her trap.

American tycoon George Harrison, his beautiful wife, Mona, and deep-sea diver Jeff Clark are off the coast of Africa hoping to salvage a fortune in diamonds at the bottom of the sea near the voodoo-haunted island of Mora Tau, and are joined by an English girl named Jan. The treasure is reported to be guarded by Zombies, walking dead-men doomed to roam the earth until men stop trying to find the sacred treasure. Here, they are walking the sea-bottom, and there is a large conflict of interest between them and the treasure-seekers.

Chuck Wheeler gets out of the Pen and sets up an elaborate heist of Vegas casino money travelling by armored truck. He enlists the help of shady club owner Joe Darren and his ex-cellmate's wife, Vi. Vi's husband Mike is a trigger happy and jealous hothead and will not grant her a divorce. Mike escapes from prison right before the armored truck job goes into motion and promises trouble as he tries to locate his associates and his wandering wife.