A recent geologic alert has discovered an abundance of emeralds in nearby Mineral Flats. Professor Sharp sends the Bionic Six to investigate. The heroes encounter "Sparky", a restorer of antique planes. They agree to help Sparky raise money by putting on an antique air show. Scarab realizes that the antique aircraft Lulubelle, a B-25 bomber, was lost with a load of emeralds. Scarab's team sets out to steal the aircraft.