 In 2002 , after the opening of Colossus , Thorpe Park officially announced the addition of Nemesis Inferno in 2003 . Construction took place throughout 2002 with the first test run being completed in December 2002 . Nemesis Inferno officially opened to the public on 5 April 2003 . According to Nikki Nolan of The Tussauds Group who operated the park at the time , the ride was installed just one year after Colossus to " help transform Thorpe Park into a real thrill park " . 
