Zips were small, flying, motorcycle-like vehicles in the Barbican in Dr. Zetlin's Lifelight fantasy. The zips were shaped like motorcycles with control pedals, a pointed nose, and two handlebars. The left handlebar controlled braking and the right one controlled speed. The pedals made the nose point down when the rider pushed it with their toes and up when they pushed with their heel. Zips could work under water, but like all Dr. Z's technology, it was useless outside of the Barbican.