Lauren Cohan, Mark O'Brien and Mia Tomlinson join Prime Video's 'Stillwater'

Left · 1Lauren Cohan, Mark O'Brien and Mia Tomlinson have joined the cast of Amazon Prime Video's "Stillwater", an adaptation of the graphic novel by Chip Zdarsky and Ramón K Pérez. 1 Centre · 1Deadline reports that the three are series regulars opposite lead Ben Hardy, who plays ex-con Daniel West. 2 Mixed · 2Cohan plays Catherine 'Cat' Keegan, a former homecoming queen described as deeply loyal to her husband Ted, who has spent years convincing herself that what they do to protect the town's secret is justified. 1 2

Mixed · 2O'Brien plays Ted Keegan, a father, farmer, military veteran and sheriff's deputy who enforces the town's strict policies, sometimes violently, while hiding a truth that could destroy his family. 1 2 Mixed · 2Tomlinson plays Cat's younger sister Laura Quinn, a spirited single mother who faced an impossible choice when her hometown changed overnight. 1 2 Mixed · 2The official description calls the show a mind-bending horror thriller in which Daniel receives a mysterious letter promising answers about his past and an inheritance, and finds a town where nothing ages, no one dies and nobody gets out. 1 2

Mixed · 2The eight-episode series was ordered ahead of San Diego Comic-Con in July 2026, according to Deadline; Greg Berlanti and Carly Wray are writers and executive producers, and Wray and Berlanti co-wrote the pilot. 2 1 Left · 1It is produced by Warner Bros. Television, Berlanti Productions, Skybound Entertainment and Amazon MGM Studios, with Robert Kirkman and Zdarsky among the executive producers. 1 Left · 1Variety quotes Berlanti and Wray on Hardy's earlier casting: "There's a toughness to him, but also something incredibly open and soulful underneath it." 1

Mixed · 2Both outlets cite the actors' credits: Cohan in "The Walking Dead", O'Brien in "The Copenhagen Test" and "Nuremberg", and Tomlinson in "The Conjuring: Last Rites", where Deadline says she previously worked with Hardy. 1 2