The Martha Graham Dance Company has been mining primal drama—Greek myth, political rebellion, human sacrifice, and every shade of grief—for 100 years now. Whether it’s Medea’s rage, Joan of Arc’s passion, or the desires of a young bride in Appalachia, the Graham dancer knows how to conjure engulfing emotion through spinal twists, pelvic contractions, the deft manipulation of fabric, and roaring commitment. As the company celebrates its centennial, a new documentary goes behind the scenes, exploring the pioneering legacy of Graham herself through the dancers who carry on her work today. Directed by Peter Schnall and Cyndee Readdean, and narrated by Meryl Streep. —Faye Arthurs