Will Stanton (
Alexander Ludwig) is a day away from his fourteenth birthday. As Will walks home with his siblings, Miss Greythorne (
Frances Conroy), the local mistress of the Manor, and her butler, Merriman Lyon (
Ian McShane), invite them to a Christmas party. Later, two farmers, Dawson (
James Cosmo) and Old George (
Jim Piddock), arrive at the Stanton house with a large Christmas tree ordered by the family. At the Manor Christmas party, Maggie Barnes (
Amelia Warner), an attractive local girl, appears. Will becomes upset when one of his older brothers begins chatting with her. When Will leaves the Manor, he is chased by an ominous figure mounted on a white horse. As the ominous figure prepares to kill Will, Miss Greythorne, Merriman, Dawson, and Old George appear and save him. Merriman names the threatening figure as The Rider (
Christopher Eccleston), who warns them all that in five days' time his power – The Dark – will rise. The four adults are Old Ones, a group of ancient warriors who serve The Light. The Old Ones take Will on a journey through time and space to a place called the Great Hall. Will is the last of the Old Ones to have been born. He is the
seventh son of a seventh son whose power begins to ascend on his fourteenth birthday. (However, Will disputes this idea because he believes he is his parents' sixth son.) Will is The Seeker, who must locate six Signs whose possession will grant The Light power over The Dark. The Rider is also seeking the Signs. Will returns home to his attic room, falls, and twists his ankle. Will's mother calls a doctor. When the doctor arrives, Will realizes that he is The Rider in disguise. The Rider demonstrates his powers on Will's ankle by alternately healing it and making it much worse before restoring it to its original injured state. He offers Will the chance to have any desire he wants fulfilled in exchange for giving him the Signs. Will discovers he has a lost twin brother named Tom, who, as a baby, mysteriously disappeared one night and was never found. Merriman instructs Will on his powers, which include sensing the Signs, summoning
superhuman strength, commanding
light and
fire,
telekinesis, stepping through
time, and the unique knowledge to decipher an ancient text in the Book of Gramarye. Will reveals the first sign, which is located within a pendant Will purchased for his sister, Gwen. Will travels through time to find the next four Signs. The Rider enlists a mysterious figure to help him obtain the Signs from Will. When Will's brother invites Maggie to their home, she reveals some of her powers to Will. Will reveals his affection for her. The Rider tricks Will's older brother Max, using his magic to partially control him. The spell over Max is finally broken when Will uses his great strength to give Max a concussion. By the fifth day, The Dark that The Rider commands has gained tremendous power and begins to attack the village with a terrible blizzard. Will locates the fifth sign. Without the sixth sign, however, the Dark continues to rise. Maggie is revealed to be a mysterious witch who is helping the Rider in exchange for eternal youth. She is betrayed by the Rider and ages rapidly, disintegrating into a flood of water while trying to steal the Signs from Will. The Old Ones and Will seek sanctuary in the Great Hall, where the Rider cannot enter unless invited. However, the Rider's final trick (impersonating the voices of Will's relatives) gains him access to The Great Hall. The Rider reveals that he has trapped Will's twin brother Tom (whom The Rider mistook for The Seeker and kidnapped long ago) within a glass sphere. The Rider sends Will into an evil dark cloud. As he enters, Will solves the riddle of the sixth Sign: He himself is the sixth Sign. With all six Signs identified, The Rider cannot touch or harm Will. Using his power over the dark, Will banishes both The Rider and The Dark. Will and Tom are reunited and return to their family, who are thrilled to see Tom. ==Cast==