Barsoom is dying, its atmosphere thinning with each passing year, the seas that once flourished upon its surface dried up eons ago. When warrior-scientist Dat Voga is asked to become Helium's ambassador to distant cities that may provide a desperate chance at life for the people of Barsoom, he leaps at the opportunity. But even as this new hope dangles on a thread, a madman seeks to hasten the Red Planet's doom-and Dat Voga is hurled headlong upon an odyssey across the chasm of Time itself!
