After more than 15 years building one of YouTube's most personal channels, Markiplier put Hollywood on notice with Iron Lung, the horror film he financed, wrote, directed, and starred in. The film pulled in close to $52 million in theaters and is now on YouTube. We get into why he treated a feature film like a YouTube video, what he learned leading a hundred-person crew, why he stays his own harshest critic, and how he sees this collision of YouTube and Hollywood playing out for creators.

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