Walter Bolliger admitted that he "owed" the park, as an inverted roller coaster could not be built several years earlier because of an exclusivity clause with Cedar Point.

[14] Speculation about a new roller coaster at Canada's Wonderland began in early 2011, when construction work started around the Dragon Fyre ride and the Go Karts.

[15] On 3 July 2011, Canada's Wonderland launched a teaser website featuring a countdown clock to 18 August 2011, 7:00 am,[16] accessible through the park's Facebook page.

[22] On 18 October 2011, the coaster's longest and heaviest lift hill track piece, standing at 36.6 metres (120 ft) long, was installed.

[12] The first test run was completed on 15 March 2012,[27] and on 18 April 2012, Canada's Wonderland announced on its Facebook account that a 30.5-metre (100 ft) tunnel would be placed at the bottom of the ride's first drop.

[28] On 19 January 2012, Canada's Wonderland launched an auction in which bidders around the world competed to be one of the first ninety-six public riders on Leviathan on 27 April 2012, a week before the park officially opened the ride.

[33][34] After leaving the station, the train turns 180 degrees to the right, then begins to climb the chain lift hill, travelling at a speed of 15.5 kilometres per hour (9.6 mph).

This is followed by another drop that enters a speed hill, which makes a high-speed turn slightly to the left at approximately 122 kilometres per hour (76 mph).

[34][35] After leaving the hammerhead turn, the train enters a second high-speed curve at approximately 96.5 kilometres per hour (60.0 mph).