Battle of the Planets cast five young people as G-Force, consisting of Mark, Jason, Princess, Keyop, and Tiny. G-Force protects Earth from the 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 the "Luminous One". The Luminous One would appear as a ghost-like, disembodied, floating head.
