EXCLUSIVE: Mark Williams has rounded out the cast of his indie drama Hal, starring Alexander Ludwig and Emma Roberts.

Newcomers include Matthew Goode (Department Q), Kate Walsh (Grey’s Anatomy), Taylor John Smith (Where the Crawdads Sing), Garret Dillahunt (No Country for Old Men), Robert Patrick (Terminator 2: Judgment Day), Colm Meaney (Star Trek: The Next Generation), Justin Bartha (The Hangover), Nicolette Sheridan (Desperate Housewives), Maurice Compte (Narcos), Kevin Chapman (Person of Interest), Ian Bohen (Yellowstone), Chris Diamantopoulos (Silicon Valley), Jason Kennedy (E! News), and Robert Treveiler (The Accountant).

We’re told Goode will portray the father of Ludwig’s title character, Hal. Further character details are under wraps.

Written by Mark Edwin Robinson, Hal is inspired by the true story behind the founding of humanitarian organization Convoy of Hope. The story follows Hal Donaldson (Ludwig), a journalist shaped by early hardship who believes his voice is his path forward. When he meets Doree (Roberts), a gifted musician, their relationship becomes the foundation that steadies him as his career takes him to places marked by deep suffering.

As Hal witnesses crisis and inequality firsthand, the line between observing and acting begins to blur. Confronted with the limits of telling stories alone, he is drawn toward a calling that requires more than words — setting in motion the events that lead to the creation of Convoy of Hope.

Since its founding in 1994, Convoy of Hope has delivered hundreds of millions of meals and provided clean water to millions of people. Operating in dozens of countries, they’re recognized for their large-scale disaster relief operations, long-term community development programs, and ability to mobilize public-private partnerships to reach people others cannot.

Shot between Atlanta and Colombia, Hal is produced by Zero Gravity Management. Other previously announced cast members include Ernie Hudson, Leslie Bibb, Aidan Quinn and Jeffrey Donovan.

Goode is repped by 42 and CAA; Walsh by Gersh, Principal Entertainment LA, and Yorn, Levine, Barnes; Smith by CAA, Vybe Trybe, and Felker McGinnis & Ryan; Dillahunt by Independent Artist Group and D2 Management; Patrick by Gersh and Coronel Group; Meaney by IAG, Accelerate, Liebman Entertainment, and Brecheen Feldman Breimer; Bartha by Gersh, Mgmt Entertainment, and Jackoway Austen Tyerman; Compte by Gersh, Zero Gravity Management, and Jackoway Austen Tyerman; Chapman by TalentWorks, Stride Management, and Jackoway Austen; Bohen by Zero Gravity Management and Hansen, Jacobson, Teller; Diamantopoulos by Paradigm, Untitled Entertainment, and Goodman, Genow, Schenkman; and Treveiler by JTA Talent and Schumacher Management.