Multiplex and megaplex theater chain shows mainstream movies in a plush setting.. In Short In 1920, Edward Durwood opened a single-screen picture house in Kansas City, Mo. Over the next 40 years, his company went on to pioneer the use of four- and six-screen theaters. In 1969, the company incorporated as American Multi-Cinema Inc. in honor of its signature multiplexes. Now, the company is known for theaters with 14 or more screens, as well as innovations such as armrests with built-in cup holders, stadium seating with LoveSeats, ATM-style ticketing and online ticket purchasing.