Published in Bullet #135, 09/09/1978.
Driving down a quiet road in New Zealand, Fireball is surprised to encounter floating above the ground a flying saucer. It turns out to not be a UFO but his friend invention, powered by magnetic energy and able to fly 4,000 miles an hour. Unfortunately someone has tampered with the controls and they almost crash. Fireball is determined to find who is behind it.