Scarlett Johansson's action thriller Lucy has overpowered Hercules to debut atop the North American box office with a $44 million (£25.88 million) haul.

Lucy, directed by Luc Besson, makes a strong debut at number one, easily beating Dwayne Johnson's outing as mythical Greek demigod Hercules, which opens with $29 million (£17 million).

Dawn of the Planet of the Apes places at three with $16.4 million (£9.65 million) in its third weekend on release, followed by The Purge: Anarchy at four and animated family film Planes: Fire & Rescue rounding out the top five.