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RiffTrax is an American company that produces scripted humorous audio commentary tracks intended to be played in unison with particular television programs and films, featuring comedians Michael J. Nelson, Kevin Murphy, and Bill Corbett and others. The three comedians' commentating style originated from their earlier television series, Mystery Science Theater 3000 MST3K , in which they would similarly mock "riff" films aloud while watching them. RiffTrax products are sold online and delivered by app, streaming video, and DRM-free download. It is also featured on Pluto TV, Twitch, and a channel on Samsung TV.