EXCLUSIVE: The X-Files alum Mitch Pileggi is set as a series regular in Walker, a reimagining of CBS’ long-running 1990s action/crime series Walker, Texas Ranger, headlined by Jared Padalecki. Additionally, Pretty Little Liars‘ alum Keegan Allen recently joined the cast, joining Padalecki and previously announced Lindsey Morgan. Like the original series, created by Albert S.