5x04 Emma & Hook #3

WHEN SHE LEARNS KING ARTHUR MAY BE HIDING HIS TRUE INTENTIONS, MARY MARGARET MUST CONVINCE DAVID AND THE HEROES OF HER SUSPICION BEFORE THEY JEOPARDIZE EMMA'S SAFETY, ON ABC'S "ONCE UPON A TIME"

Sinqua Walls Guest Stars as Lancelot, Joana Metrass Guest Stars as Guinevere and Liam Garrigan Guest Stars as King Arthur

"The Broken Kingdom" - After receiving a cryptic warning from Lancelot about Arthur's intentions, Mary Margaret realizes Arthur may be the heroes' biggest threat, but when she is unable to convince David of the danger, she takes matters into her own hands. Meanwhile, Hook's unwavering love for Emma provides a glimmer of hope in her struggle against the unrelenting voice of Rumplestiltskin. In a Camelot flashback, Guinevere senses that Arthur is losing his way, consumed by his obsession with making Excalibur whole, so she sets out with Lancelot on her own quest into the heart of darkness. In Storybrooke, Dark Emma unleashes a secret weapon in the next phase of her plan to find the brave soul she needs to draw Excalibur from the stone, on "Once Upon a Time," SUNDAY, OCTOBER 18 (8:00-9:00 p.m., ET) on the ABC Television Network.