Dr. Isaiah Norman is experimenting with molecular energy when his lab explodes. Injured, he gets off a call for help to the Quest team.
Arriving, the team finds the lab wrecked and Dr. Norman missing. While Dr. Quest reads Dr. Norman's journal, Race and the boys take jetpacks to scout a strange trail of burn marks through the forest.
The follow the trail of marks and destroyed trees through a native village and discover the end -- whatever made the trail is moving toward another village. When it emerges from the trees, they see -- nothing at all. Whatever is causing the wreckage is ... invisible!
Race and the boys return, and discover that Dr. Norman has accidentally created a "creature" of pure energy -- a creature that must absorb other forms of energy to survive. Even the electrical energy of the human body will do...
The team devises a plan. First, they make the creature visible. Next, they lure it to some improvised equipment, using Dr. Quest as a lure. Once they have it there, they will destroy it by reversing what Dr. Norman did in creating it.
The creature follows Dr. Quest ... Race throws the switch ... after much fireworks, the creature is destroyed. Alas, Dr. Norman is gone, a great setback to the field of molecular energy.