When you think of Kelsey Grammer, you likely picture the erudite, buttoned-up, and eternally exasperated Dr. Frasier Crane. For two decades, he was television’s favorite intellectual therapist. So, when Starz unveiled Boss in 2011, audiences were met with a whiplash-inducing transformation.

The show is unapologetically Shakespearean. Think King Lear meets The Godfather . Kane’s estranged daughter (played with venomous brilliance by Hannah Ware) tries to destroy him. His wife (the legendary Connie Nielsen) turns into Lady Macbeth. His protégé (Martin Donovan as Ezra Stone) waits for the slip.

This is the story of why Boss remains one of the most underrated, brutal, and brilliantly acted dramas of the 2010s. Set against the steel-gray skyline of Chicago, Boss introduces us to Mayor Tom Kane at the absolute zenith of his power. He has run the city for decades, not through democracy, but through a feudal system of favors, blackmail, and iron-fisted alliances. He is the king, and the City Council are his court.

But the king has a secret. Kane is diagnosed with Lewy body dementia—a degenerative neurological disorder that causes vivid hallucinations, memory loss, and loss of motor control. In the pilot’s stunning opening scene, a doctor delivers the news: "You have a year, maybe eighteen months. At the end of it, you won't know who you are."