Markiplier, the famous YouTube creator, is preparing to release his directorial debut film, Iron Lung, a horror movie based on the video game of the same name. Not only did he direct it, but he also starred in, co-wrote, produced and self-financed the project, which is set to hit theaters early next year. Get to know the cast behind Iron Lung and more details on the movie here. What Is Iron Lung About? According to Variety, this is Iron Lung's description as told by Markiplier: "The stars are gone. The planets have disappeared.