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”.The 750-metre-long (2,460 ft) Nemesis Inferno is themed around an erupting tropical volcano. The ride stands 29 metres (95 ft) tall, features a top speed of 50 miles per hour (80 km/h), and four inversions.