A scientist's kids are sucked into a TV screen and wind up in the Stone Age with cavemen and dinosaurs.

Sergeant Thomas Duncan takes his men behind enemy lines to recover a secret government fighter copter and its pilot, a secret weapon all his own. But once stationed in the dense jungle brush of Vietnam, their radio goes out all hope of contacting their home base is out, and it is up to Duncan and his men to get to the hook up point by the agreed time. A traitor in the home camp is sending messages to the enemy side; Duncan must hurry!