The first Zork game done by Activision was Return to Zork, which looked cheap in many spots and although had some innovations it wasn't very impressive.  Next was Zork: Nemesis, which was worlds better but also very  dark and serious.  The only thing that made it a 'Zork' game were a few  familiar names and locations thrown around.  It lacked the humor of a true  Zork game.