Dan Dare returned to Earth to consider his next move in tracking the source of the Biog invasion. In London he met Rok, a lupine alien from the planet Wolf-4. Dare agrees to fill the vacant position of navigator on Rok's ship in a voyage to the galactic rim. Meanwhile, at the galactic rim, The Mekon was released from his prison-ship and taken to the planet Verath where he met the ruler The Two of Verath.