The cast and crew of the new HBO series talk in great detail about how Colin Farrell transformed on-screen, physically and artistically, into becoming Oswald "Oz" Cobbs.

Colin Farrell put on layers of prosthetics, costumes, and mannerisms to portray Oswald “Oz” Cobb in the 2022 superhero feature The Batman and its HBO spin-off The Penguin. So, he is probably one of the best people to understand the psychology of his character.

Farrell joined "Good Morning America" on Wednesday to dish about his starring role as Oswald "Oz" Cobb, also known as the Penguin. He is reprising the role, which he first played in 2022's "The Batman," which starred Robert Pattinson as Gotham's reluctant hero.

In a career spanning nearly 30 years, Colin Farrell has had some extraordinary experiences travelling the world, working with directing greats, starring in huge blockbusters, and being nominated for an Oscar.

Farrell’s physicality matches his minutely calibrated vocal rasp as Oz. He’s not recognizable as Colin Farrell but in this world of deception and shadows, the casting works. And for all the low-light nightclub murmuring going on,

Video reveals the impressive transformation of Colin Farrell to portray the classic villain in "The Penguin," in which he returns as the crime boss, originally portrayed in "The Batman" by Matt Reeves.

Previously covered in tattoos, Colin Farrell decided to get rid of the ink to make one aspect of his life a little easier. The Irish actor has been receiving rave reviews for his performance as the Batman villain in The Penguin.