Once Upon a Time Siege Perilous

Arthur joins David on a quest to obtain a magical relic Regina needs in order to contact Merlin. Meanwhile, Mary Margaret learns about Lancelot’s fate., Arthur joins David on a quest to obtain a magical relic Regina needs in order to contact Merlin. Meanwhile, Mary Margaret learns about Lancelot’s fate; and back in Storybrooke, Hook is wary when Emma asks him to help her remove Excalibur from the stone.