Installed in 2005 at a cost of $13 million, Hydra the Revenge is one of Dorney Park's headline attractions. The floorless coaster, manufactured by Swiss firm Bolliger & Mabillard, replaced former wooden roller coaster Hercules in the park's line-up and occupies the same site.

Unusually, riders pass through an inversion (a heartline roll) prior to ascending Hydra the Revenge's opening lift hill, an are photographed in the process. Following this, things are a little more conventional, with the coaster racing through a series of further inversions, including an inclined dive loop, a zero-g roll, two corkscrews and a cobra roll.