The Las Vegas Hillbillys

A space ship crash lands on the third planet of a distant solar system, killing all hands except for a young boy named Tang. The rescue ship arrives some 20 years later. One of the crew, a girl named Linda meets Tang and falls in love with him. They are attacked by the native humanoids of the planet and many of them are killed off. Also, the crew encounters many strange beasts on this strange, but somewhat familiar world.

Two boys, Chuck and Sam find a time capsule in a cave and take it to Professor Seateck. The professor finds that the capsule contains a message that had been sent to the planet Meeca whose inhabitants helped Earth in its defense against attacks by the Space Islands in 1960. Sam, Chuck, and the Professor travel to Meeca with the Meecan robot Robo. They are attacked by the Space Islands en route but arrive safely to meet with the friendly Meecans.