The sons of the great detective Fenton Hardy, Frank and Joe are eager to impress their father with their mystery solving skills.

It's 1885 in Arizona and an Army Captain has dispersed his troops to keep the whites off of Government land thereby keeping the peace with the Apaches. But there are those in Tucson that want the miners back looking for gold and they put pressure on officials in Washington. Soon a new commander arrives, the troops are recalled, and the miners go after gold. Whites then kill a miner with an arrow so they can attack the Indians hoping the troops wipe them out when they retaliate.

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.

An astronaut returns to Earth as the no-pulse host of an alien monster's embryos; he is discovered by a loony farmer who find ways to feed his new critter.