There are a few different covers for FvsZ #5, but the one that is taking home the gold pays homage to one of the greatest movie franchises of all time, (Hehe... time.) Back to the Future.
It appears to be an amalgamation of the three original BttF posters. They tossed in the classic Marty attire from I, the futuristic shades from II with the western theme from III. Nice job guys.
UPDATE: The picture indicates issue #9. Though when researched it was listed as a #5 cover. The actual issue # is currently uncertain to us.