"I was basically covered wrist to ankle," the actor tells PEOPLE of his transformation in 'The Penguin.' "The only things that were me were my hands and feet."

But the very first episode of HBO’s The Penguin ends with something Batman fans have definitely never seen before: The Penguin (Colin Farrell) rocking out to Dolly Parton‘s “9 to 5” after getting away with murder.

Colin Farrell had to undergo a complete transformation to play the role of Oz Cobb in HBO’s The Penguin. According to Farrell, that even included adding on a fake crotch. Speaking to People ahead of The Penguin’s premiere tonight,

When Colin Farrell looked in the mirror after donning prosthetic makeup for his role as the title character in the Max series “The Penguin,” he could no longer recognize himself.

The Penguin follows Farrell as his Batman villain who is working his way to the top of the Gotham City underworld. For his role of Oz Cobb, Farrell had to be fully suited up to the point where he looked unrecognizable.

Deirdre O’Connell dishes on her character’s relationship with Penguin while chatting with THR at The Penguin premiere in New York. Plus, she reveals it was easier playing opposite of Colin Farrell when he had the prosthetics on.