Adam Strange: The Silver Age Omnibus #1

An Earth archaeologist is caught by a \"zeta-beam\" and teleported to Rann near Alpha Centauri where he meets Alanna and Sardath. Alien invaders, called The Eternals, attack the planet while Adam and Alanna journey to the Brigadoon-like city of Samakand to locate a life-metal called \"vitatron.\" Adam tricks the aliens so they're stuck in Samakand, but then he fades away, returning to Earth, awaiting the next zeta-beam.