When an Aircraft mysteriously disappears in a test flight, Steve's friend Kelly Wood becomes the prime suspect, since she was the one driving the plane at the time. But for some reason, she has no memory, except remembering seeing a Japanese Zero plane from World War 2. Since no one believes her, Steve knows he must clear his friend's name, before it's too late.

Steve and Rudy go to check up on scientist, Cheryl Osborne, who was performing research on chimpanzees but who has ceased communications. When they arrive they find something has destroyed the lab, and Rudy is bitten by a rampaging chimpanzee. Rudy begins to turn psychotic and Steve must both stop him and find Osborne before it's too late.