Cast of Thumbsucker

Lou Taylor Pucci plays Justin Cobb, a high school student who struggles with thumb-sucking and seeks to find his identity.

Tilda Swinton portrays Audrey Cobb, the mother of Justin who reflects on her relationship with her son and her own life challenges.

Vincent D'Onofrio plays Mike Cobb, Justin's father who has difficulty understanding his son's struggles.

Keanu Reeves takes on the role of Perry, a motivational speaker who influences Justin in his search for self-discovery.

Benjamin Bratt plays Matt Schramm, a debate coach who helps guide Justin through competition.

Kelli Garner portrays Rebecca, a girl from Justin's school who becomes an important part of his life.

Chase Offerle plays Joel Cobb, Justin's younger brother who observes the family's dynamics.

Vince Vaughn plays Mr. Geary, a teacher who provides guidance to Justin.

Bob Stephenson appears as the Debate Official, overseeing the debate competition.

Nancy O'Dell plays herself, offering a cameo in the film.

Dakota Goldhor plays the Girl on Plane, who interacts with Justin during his journey.

Eric Normington plays the Hotel Desk Clerk, assisting characters at a hotel.