Though Marvel Entertainment owns and finances properties like "Iron Man" and "Thor," Fox controls "Fantastic Four" in perpetuity -- as long as it continues making the films. Fox has the same arrangement on Marvel Comics properties "X-Men," "Daredevil" and "Silver Surfer."But how long, I wonder, does Fox have to wait to make a new FF movie before the rights revert to Marvel? "4: Rise of the Silver Surfer" came out 26 months ago. Find all of Variety’s story on the matter here.