Mary Sandin is a major character in The Purge (2013). She is portrayed by American actress Lena Headey.
Mary is the wife of James Sandin and the mother of Charlie and Zoey Sandin.
She is first seen welcoming her husband home as she is preparing dinner, while her son Charlie startles her with a bizarre remote control toy. While the family eats dinner together, Mary complains about Zoey using the word 'penis', though Zoey could care less about her mother's opinion.
After locking down for Purge Night, Mary spends some alone time running on a treadmill.
At one moment during the film's events, she stands against the purgers that break into the house, armed with two handguns, but she does pretty poorly, not killing a single purger.
As Mary walks through the house, a male Purger creepily watches and stalks her from afar, waiting for the right moment to strike. Later, as the neighbors start killing the Purgers, Mary is overpowered by one of the female purgers, who decides to play with Mary. As she torments Mary by tickling her ribs and belly, she raises a machete, ready to kill her, only to be shot in the head by Mrs. Halverson.