Boneshaker was a Mondial Supernova flat-ride located at Alton Towers in Staffordshire, England. It first opened at the park in 1995 as Energizer before being revamped as Boneshaker in 2001.
Energizer first opened on 18 March 1995 in the "Festival Park" area, on the former site of 1001 Nights beside the popular Corkscrew roller coaster.
When X-Sector opened in 1998, Energizer was re-located to the new area and received a new look. It operated here until 2000, when it was moved to make way for Submission, a Chance double inverter.
For 2001, Energizer returned to its original location in the newly redesigned "UG Land" area, now rethemed as Boneshaker. The ride's program was modified to deliver a less intense and slower experience, due to the area now mainly catering to families. In these final years, the ride experienced recurring faults and closed on 9 November 2003, reportedly due to mechanical failure in the ride's gearbox. At the end of 2004, it was removed to make way for Rita: Queen of Speed the following year.