“The Essex Serpent,” a six-episode period fantasy series based on Sarah Perry’s New York Times-bestselling novel of the same name, stars Hiddleston as a small-town priest in Victorian England who teams up with a grieving widow to investigate the existence of a mythical serpent. Claire Danes co-stars as the widow, Cora Seaborne, in the genre-bending period piece that promises to continue Apple’s recent hot streak of buzzy television shows. The show is set to premiere on Apple TV+ next month, but the tech giant has released the first trailer for the limited series today. “The Essex Serpent” was written by Anna Symon, from Perry’s book. Clio Barnard, the auteur behind “The Arbor” and “The Selfish Giant,” directed all six episodes. Barnard and Symon, both previous BAFTA nominees, also serve as executive producers alongside Jamie Laurenson, Hakan Kousetta, Iain Canning, Emile Sherman and Patrick Walters. In addition to Hiddleston and Danes, the cast includes Frank Dillane, Clémence Poésy, Michael Jibson, Lily-Rose Aslandogdu, Jamael Westman, Ryan Reffell, and Hayley Squires. Sign Up: Stay on top of the latest breaking film and TV news! Sign up for our Email Newsletters here.