Is this really happening? Eureka is back for its fifth and final season Monday (9/8c, Syfy) with a humdinger of an episode that has the starship Astraeus landing safely on Earth after its unplanned launch. But the crew members weren't in outer space for only a few hours like they thought — they were out there for four years! Naturally, the folks back home have moved on with their lives. Kids have grown up. New romances have blossomed. And sinister forces are now in charge of Global Dynamics. TV Guide Magazine spoke with Colin Ferguson — aka Sheriff Jack Carter — about these wild developments, the show's surprise demise, and what's in store for the series finale.