Colin Farrell has undergone a remarkable transformation for his role as Oz Cobblepot in HBO's new series 'The Penguin,' which follows his character's rise in Gotham's criminal underworld. Farrell described the intense process, which involved over four hours each day for makeup and prosthetics, making it a liberating yet surreal experience, akin to a cat seeing itself in a mirror. He embraced the 'blank slate' effect this transformation provided, allowing him to explore his character deeply without the usual self-identity constraints. The series, set after the events of 'The Batman,' showcases a grimmer Gotham devoid of hope, focusing on the chaotic rise of the Penguin amidst crime and power struggles. Critics have noted the show's dark, complex narrative and its departure from traditional superhero themes. Farrell's dedication to the role has been praised, with his portrayal of the Penguin described as both compelling and unsettling.