The series premiered in 1975. Stopped in 1977 after 8 issues.

The title character Tragg and his mate Lorn are supposedly the result of advanced aliens having experimented with Neanderthal humans. The result was two Cro-magnons that became our own ancestors. They are living in a dangerous world filled with brutish Neanderthals and ferocious dinosaurs, and they are visited by, at first, benevolent aliens from the planet Yargon. Later on, the aliens try to subdue the earthlings.

The full title of the series is Tragg and the Sky Gods.