Since being founded by Fabian Riggall in 2007, Secret Cinema has put on more than 70 productions with such titles as Stranger Things, Casino Royale, Blade Runner, Back to the Future, Star Wars and Alien. A source close to the deal said it was worth in excess of $100 million. Secret Cinema, the U.K.-based immersive entertainment pioneer, has been acquired by cultural experience company TodayTix Group, which has plans to permanently bring the company to the U.S.