Ritchson leads the cast as Jack Reacher, and he'll be joined by a few new faces as he reunites with his old crew from the US Army 110th MP Special Investigation Unit.
"Krypton" star Shaun Sipos plays Reacher's closest friend from the unit, David O'Donnell, while "Inhumans" and "Coroner" lead Serinda Swan plays Karla Dixon.
Rounding out the main cast are Rory Cochrane as Shane Langston, and Ferdinand Kingsley as "A.M." Meanwhile, Luke Bilyk will play Calvin Franz, the unfortunate teammate whose death kickstarts the whole story.
Also in the cast are "Tulsa King" star Domenick Lombardozzi as Guy Russo, Edsson Morales as Manuel Orozco, Andrés Collantes as Jorge Sanchez, Shannon Kook as Tony Swan, Ty Olsson as Saropian, and Dean McKenzie as Stan Lowery.
Ritchson previously appeared opposite "The Fall of the House of Usher" stars Willa Fitzgerald and Malcolm Goodwin in the first season, although they're not expected to return in season two.
When speaking to Collider, Ritchson touched on saying goodbye to most of the season one cast. He said: "I really fell in love with everybody that I worked with. Every cast member, all the way down to day players who are there just for one line, were some of the best actors and actresses that I've ever worked with.
"Not only that, they were wonderful people too. They're great to be on set with. So, it's rather tragic that there's a chance that I may not see some of them again," he added. "They set the bar so high that we'd be remiss not to see them show again. So, I hope we do."