After an Air Force squadron disappears over the Bermuda Triangle, two more planes are dispatched to discover what happened, but they too disappear. Meanwhile, Jessica, Jeff and Billy visit the aircraft carrier in the vicinity of the Triangle after being granted an interview with the ship's commander. With the situation becoming more dangerous, the Justice Magazine crew is ordered to leave the area, but their jet-copter disappears like the jets, only to discover a hidden dimension containing a prehistoric-like island. Jessica and her team explore the island, and after Jessica becomes Spider-Woman to deal with some dinosaurs, discover a tribe of Neanderthals. They are using advanced technology and are under the control of Dr. Morrison, who discovered the island thirty years ago and is preparing to take over the Earth. Spider-Woman attempts to free Jeff and Billy from Morrison, but she too ends up as a captive along with the missing pilots. The doctor orders his cavemen to go to the Bermu
