 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 ( as he has with hundreds of roller coasters ) , 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 , with Nemesis being cited by many as a superior ride . 
