Thorpe Park PR manager Nancy Edwards said a crucial part of the one-year contract would be the promotion of the new ride, which has cost £12m.
The ride and its name will be unveiled at a launch in four weeks' time.
Thorpe Park expanded its attractions last month, when the 360-degree, five-seater Samurai ride was moved from Chessington World of Adventures, which is also owned by Tussauds. Samurai riders sit in pods that spin 60ft above the ground.
But Nemesis Inferno remains Thorpe Park's most popular attraction. Riders swoop, their legs dangling, through more than 750 metres of suspended track at speeds of up to 48mph.
Tussauds Group was acquired in March by investment firm Dubai International Capital for £800m.