Nemesis Inferno is a steel inverted roller coaster at the Thorpe Park theme park in Surrey, England, UK. Its layout was conceived and designed by John Wardley and then built by Bolliger & Mabillard with Werner Stengel providing the layout calculations, the same Swiss firm that built the related Nemesis inverted roller coaster at Alton Towers. As a result, Nemesis and Nemesis Inferno are often compared. It is also listed on the Alton Towers website that the ride is “Nemesis’ Sister”.

An inverted roller coaster is a type of steel roller coaster in which the train runs under the track with the seats directly attached to the wheel carriage. Riders are seated in open cars, letting their feet swing freely. The inverted coaster was pioneered by Swiss roller coaster manufacturer Bolliger & Mabillard in the early 1990s with the development of Batman: The Ride, which opened at Six Flags Great America on May 9, 1992.