In one of the eleven dimensions, Machine World is a planet populated by Engines- giant sentient living machines with individual personalities and capabilities. They succeed in driving the destructive Ban KiZoku Gaiarc clan off their world during one of their largest planet-wide races. Unfortunately, the Gaiarc decide to move on into the dimension where Earth is since it seems to be an easier target for them to conquer in order to turn it into the ideal world of unchecked pollution and waste which they favor. Three Engines cross the dimensional barrier to pursue them, but they will begin to suffer fatal rusting if they exist in the atmosphere of the Human World for more than ten minutes at a time! To protect against this, they separate themselves into two halves- inanimate Engine Casts which are smaller versions of their physical bodies, and Engine Souls which contain their life energy and personality. Therefore, they and their smaller rust-resistant assistant Bomper chose three young humans to fight the Gaiarc in their place, and restore them to their larger forms whenever they are needed. Together they form the Flame-god Taskforce Go-On Rangers!