If you thought you knew the beginnings of the Marvel Universe, you were wrong!

Odin and his Prehistoric Avengers represent a period of history that's never been explored - until now! Witness the origin of the very first Ghost Rider, who rides a flaming woolly mammoth... and battles a savage and familiar foe! Back in the present, in the aftermath of their world-shaking battle against the Dark Celestials, the new Avengers team is officially formed - complete with a startling new headquarters at the top of the world! Behold the wonders of Avengers Mountain. But someone who doesn't seem impressed is Namor, the ferocious lord of Atlantis - and his rage may turn the oceans red with blood!

Collecting: Avengers 7-12.