Joe Otterson TV Reporter The upcoming Peacock series adaptation based on the Liz Moore novel “Long Bright River” has added three new series regulars, Variety has learned. Ashleigh Cummings, Callum Vinson, and John Doman have all joined the show alongside previously announced lead Amanda Seyfried as well as Nicholas Pinnock. The series is described as a suspense thriller that “tells the story of Mickey (Seyfried), a police officer who patrols a Philadelphia neighborhood hard-hit by the opioid crisis.