Battle of the Planets cast five young people as G-Force, consisting of Mark, Jason, Princess, Keyop, and Tiny. G-Force protects Earth from planet Spectra and other attacks from beyond space. The most prominent field commander of the Spectra forces was a villainous, masked individual known as Zoltar. Zoltar would receive his orders directly from a being he would refer to as "Luminous One". The Luminous One would appear as a ghost-like, disembodied, floating head. Who, or what this being actually was, is never explained in any detail throughout the series. The main ship of the G-Force team was called the Phoenix, which could carry, transport and deploy four smaller vehicles, each operated by one team member. The four vehicles included a futuristic race car with various hidden weapons driven by Jason; this vehicle was concealed within the Phoenix's nosecone. The "galacti-cycle", a futuristic motor cycle the Princess rode, was stored within the left wing capsule of the Phoenix. Keyop's "Space Bubble", an all-terrain, tank-like vehicle capable of VTOL as well as being a submersible craft, was held in the right storage capsule of the Phoenix. And lastly, a futuristic jet fighter Mark pilots was stored in the top rear section of the Phoenix command island structure, and which used its tail fin to make up the center tail fin of the Phoenix. The fifth crew member, Tiny, was assigned to pilot the Phoenix rather than one of the detachable craft...