Runt follows the life of Cal (Boyce), a teenage boy who experiences troubling incidents that make him a cold and callous person.

[4] Cal is interested in Gabriella (Hildebrand) but is being bullied by her boyfriend, Vic (Knight), and his group of friends.

The character devolves into pain, self-destruction, and abuse after being subjected to bullying by his peers in high school.

[5] In July 2018, it was announced that Cameron Boyce had joined the cast of the film, with William Coakley directing from a screenplay he wrote alongside Armand Constantine and Christian van Gregg.

[7] On that same month, Jason Patric, Brianna Hildebrand, Tichina Arnold, Aramis Knight, Nicole Elizabeth Berger, and Mitch Silpa joined the cast of the film.