The Watcher cast is including:
Bobby Cannavale as Dean Brannock (7 episodes), Naomi Watts as Nora Brannock (7 episodes), Jennifer Coolidge as Karen Calhoun (7 episodes), Noma Dumezweni as Theodora Birch (7 episodes), Mia Farrow as Pearl Winslow (7 episodes), Terry Kinney as Jasper Winslow (7 episodes), Isabel Gravitt as Ellie Brannock (7 episodes), Luke David Blumm as Carter Brannock (7 episodes), Henry Hunter Hall as Dakota (7 episodes), Margo Martindale as Mo (7 episodes), Christopher McDonald as Detective Rourke Chamberland (7 episodes), Seth Gabel as Andrew Pierce (7 episodes)