RiffTrax is an American production company specialising in applying humourous and satirical audio commentaries (known as "riffing") to preexisting films and other video content.
RiffTrax's releases feature comedians poking fun at films in satirical commentary tracks. The project is a conceptual spinoff of cult television series Mystery Science Theater 3000, and the main range of RiffTrax releases star former MST3K actors and writers Mike Nelson, Kevin Murphy, and Bill Corbett.
Some of RiffTrax's riff releases take the form of standalone audio files the viewer plays in sync with their own separately-acquired copy of the targeted film, avoiding the need for RiffTrax to secure release rights to the film itself.
Other RiffTrax releases, including Dr. Who and the Daleks and Daleks' Invasion Earth 2150 A.D., have had all necessary release rights negotiated and are made available as full streaming and downloadable Video On Demand editions of the complete films with applied RiffTrax commentary. RiffTrax does not sell the original unriffed films.
RiffTrax also perform live theatrical riffings in events simulcast to cinemas throughout the United States and Canada, and often released later as a VOD. On 17 August 2017 they performed a live riff of The Five Doctors with an encore showing of the event 24 August 2017, but this riff has not yet been made available in recorded form.