Keys to the Dimensions Series by Kenneth Bulmer

Scobie Redfern was just a nice good-looking American young man who had never heard of such things as Portals, parallel worlds, and Trugs. So when someone materialized in his apartment with the Trugs in hot pursuit, it all seemed sort of a funny game. But there was nothing amusing about it once the monsters themselves arrived... moreScobie Redfern was just a nice good-looking American young man who had never heard of such things as Portals, parallel worlds, and Trugs. So when someone materialized in his apartment with the Trugs in hot pursuit, it all seemed sort of a funny game. But there was nothing amusing about it once the monsters themselves arrived. For it wasn't long before Scobie was himself running for his life from world to world and from Portal to Portal just to keep one jump ahead of the Trugs, and hoping that the Wizards of Senchuria might, just might, be able to get him back home alive and whole! less

Cy Yancey dreamt of being a big game hunter adventuring in Africa. Little did he know that stepping into an alleyway outside his rifle club would lead him to the most important hunt in his life, a hunt that would take Cy much farther than Africa, a hunt through the worlds of the Dimensions, seeking, of all things, Earth! For Yancey, in trying to grab a cab, ends up hitching a ride with Porteurs Zelda and Jorine - escapees from the power of the mysterious Contessa... moreCy Yancey dreamt of being a big game hunter adventuring in Africa. Little did he know that stepping into an alleyway outside his rifle club would lead him to the most important hunt in his life, a hunt that would take Cy much farther than Africa, a hunt through the worlds of the Dimensions, seeking, of all things, Earth! For Yancey, in trying to grab a cab, ends up hitching a ride with Porteurs Zelda and Jorine - escapees from the power of the mysterious Contessa. Fleeing with them, Yancey is bounced from one Dimension to another until he arrives on Jundagai, planet of the Hunters. On Jundagai lies the answer to Yancey's dreams. The Hunt reigns supreme, though often one is not sure what the quarry is. But Jundagai holds still a greater attraction. Jundagai, Yancey's prison, holds the key to home. Yancey has only to find the right lock before death finds him. less