In 'The Machinist', Christian Bale undergoes an incredible physical transformation to portray Trevor Reznik, an industrial worker suffering from severe insomnia. Bale lost a significant amount of weight for the role, giving a hauntingly emaciated appearance. The film follows Reznik's descent into madness as he becomes increasingly paranoid and delusional. Bale's performance is intense and gripping, showcasing his dedication to his craft. 'The Machinist' is a psychological thriller that keeps viewers on the edge of their seats.