The studio plans to squeeze more life out of its undead hit and space sequel. Paramount and a clutch of exhibitors are going back to the future for a week with an old-fashioned double feature of summer tentpoles World War Z and Star Trek Into Darkness starting Friday. The twin bill screens in 3D or 2D through September 5 in select AMC, Regal, Carmike, Marcus and other theaters for the price of a single ticket. It’s the second stunt playdates for Brad Pitt’s zombie flick — third if you count a late-add IMAX run — following its $50 “Mega Ticket” deal that included an advance screening, a home video copy of the film, 3D glasses, a poster and popcorn. With more than $526 million worldwide, WWZ is Pitt’s highest-grossing film ever. J.J. Abrams’ Star Trek Into Darkness has banked $458.7M worldwide and spawned another sequel.