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

Prime Video has cast three series regulars opposite Ben Hardy in the lead roles of 'Stillwater': Lauren Cohan (The Walking Dead), Mark O'Brien (The Copenhagen Test) and Mia Tomlinson (The Conjuring: Last Rites). Stillwater, adapted from Warner Bros. Television, Berlanti Productions and Skybound Entertainment, is based on the Skybound graphic novel written by Chip Zdarsky and illustrated by Ramón K. Pérez. […]

Prime Video's Stillwater has cast three series regulars opposite Ben Hardy: Lauren Cohan (The Walking Dead), Mark O'Brien (The Copenhagen Trial) and Mia Tomlinson (The Summons: The Last Rites).

Adapted from Warner Bros. Television, Berlanti Productions and Skybound Entertainment, Stillwater is based on the graphic novel Skybound by Chip Zdarsky and Ramon K. Perez. This series is a horror thriller that revolves around Daniel West, Hardy's former accuser. When Daniel receives a mysterious letter promising answers about his past and a significant legacy in the small town of Stillwater, he discovers a community where nothing ages, no one ever dies, and no one ever moves out. In related news, Mike Flanagan says the band 'Became Our Musical Identity' rewrote the 'Carrie' finale after hearing Haute & Freddy's song.

Cohen stars as Kathryn "Cat" Keegan, a former homecoming queen whose small-town charm has turned into something more violent thanks to dozens of old grudges and regrets. Deeply loyal to her husband Ted, a sheriff's deputy played by O'Brien, Cat has spent years convincing herself that what they do to protect the town's secret is justified. Watch on Deadline

O'Brien's Ted Keegan is a father, farmer and veteran soldier - a tough man who has spent most of his life following orders and keeping secrets. As a deputy in Stillwater, he enforces the city's strict policies, sometimes through violence, which means hiding the truth that could destroy his family.

Tomlinson plays Cat's younger sister, Laura Quinn, a tough single mom who had her hands full long before the people of Stillwater suddenly stopped aging or dying. When her hometown changes overnight, Laura is faced with an impossible choice that will change her future - and the entire town - forever.

Stillwater is helmed by executive producers Greg Berlanti and Carly Wray, who co-wrote the pilot episode. The eight-part series was ordered ahead of San Diego Comic-Con in July 2026.

Other executive producers on the series include Sarah Schechter, Lee London Redman, and Robbie Rogers through Berlanti Productions and its overall deal with WBTV. Robert Kirkman, David Alpert, Rick Jacobs, Glenn Geller, and Zeddarski via Skybound Entertainment. and Jonathan Gabay

New series regular Cohan is best known for her role as Maggie Greene on the hit zombie series The Walking Dead and the spin-off The Walking Dead: Dead City, which she executive produced. Next, he will star in Todd Flaherty's Boys Like Daniel, opposite Matt Bomer, and Eric Stultz's Embers, opposite Jake Epstein. The British-American actor is repped by Anonymous Content, CAA and Hansen Jacobson Teller.

O'Brien was recently seen in Peacock's The Copenhagen Test and the acclaimed World War II drama Nuremberg. Upcoming, he produced the Netflix thriller Jed Mercurio's Warner Bros. action thriller F.A.S.T. Written by Taylor Sheridan and the dark comedy Little One produced by Zach Kerger and Roy Lee. He is repped by UTA, Thruline Entertainment, Lichter, Grossman, Nichols, and The Characters Talent Agency.

For British actress Tomlinson, Stillwater marks a reunion with Hardy following Warner Bros.' The Conjuring: Last Rites, where she played Judy, the daughter of paranormal investigators Ed and Lorraine Warren. He is repped by UTA, Julian Belfridge Associates and Peikoff Mahan.

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