Hex is situated within the grounds of the Towers, with the queue line and pre-show sections located inside the Towers. The Madhouse section is located in a modern building hidden from view.
The ride is based on the legend of The Chained Oak, a tree situated near Alton Towers whose branches are tied together with chains. The legend says that on an autumn night in 1821 the Earl of Shrewsbury was returning to his home, Alton Towers, when he was approached by a beggar. After being cruelly dismissed, the beggar cast a curse on the Earl that for every branch of the oak tree which fell, a member of the Earl's family would die. That night, following a storm a branch broke and fell, and a member of the Earl's family suddenly died. The Earl immediately had every branch of the tree chained, so it would remain intact.
Hex builds upon the legend, with one of the branches being taken to the Towers for experimentation and buried for nearly 200 years, only found during recent renovation work. Riders are led to this branch, which is located in the centre of the Madhouse.