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RiffTrax are comedy audio commentaries of movies, television programs, and short films featuring Mystery Science Theater 3000 (MST3K) comedians Michael J. Nelson, Kevin Murphy and Bill Corbett heckling (or riffing) films in the style of MST3K, a TV show in which Nelson was the head writer, and later the host. RiffTrax products are sold online and delivered by app, streaming video, and download.