"Peaky Blinders," the BBC drama following the exploits of a gangster family rising to the ranks in the aftermath of the first World War, features a stellar star cast and well-informed characters. Upon meeting leading man Cillian Murphy's Tommy Shelby, the fierce family patriarch and a crime boss set on moving up in the world regardless of the cost, viewers were enamored with him. He's strategic and always prepared, a step ahead of his enemies. Well, most of them, at least.

In season 4 of "Peaky Blinders," we're introduced to Adrien Brody's Luca Changretta, a man hardened by systemic prejudice. He backs Tommy into a corner when he least expects it, hits him when he's most vulnerable, and transforms the show for the better. He's not a one-dimensional villain — Luca is reserved and cunning, which makes him more unsettling than an outright villain. Brody's nuanced performance cemented Changretta as...