Local politician Tommy Caffee's life gets complicated when his gangster brother returns home to Providence.

Isabelle seeks revenge on the Nova Group after they attack Shawn. Alana confronts the man responsible for killing her husband and son in a car accident nine years ago.

As Tolliver tries to find a respectable employee suitable to be his liaison with Hearst, Swearengen tries to understand the reasoning behind Hearst's actions. The conflict becomes more tense as Dority and Captain Turner violently settle their differences. Bullock tries to finally settle the dispute between Steve and Hostetler and another murder brings Bullock once more face to face with Hearst, forcing him to take action. Trixie becomes suspicious of Alma's odd behaviour at the bank. Ellsworth and Alma have a close encounter that alters their relationship. Langrishe welcomes more arrivals from his theater troupe.

Quinn and Ryan learn something shocking about the alleged blackmail scheme against Beck; Adrien's "generosity" becomes a point of contention between Ethan and Jen; and Nicole is offered a new position at the Varland Resort.

Johnny investigates an apparent hate crime, which leads to the voluntary 'confession' and arrest of a former neo-Nazi's son. Soon after, Johnny has visions that convince him that the young man isn't responsible for the crime and sets out to find out who the real culprit is.

Vince, Eric, and Ari seek to find a resolution to scheduling conflicts that would prevent Vince from doing both Medellin and Aquaman 2. Turtle deals with Saigon's rising popularity, while Ari deals with his daughter's continued obsession with Max.

Paris and Nicole arrange surprise commitment ceremonies for the real-life parents of the house.

Carlos travels though time to give us the real reason behind the 1st Amendment. A new music video is unveiled and workplace gadgets to help with office politics.

Louie is none too thrilled when Kim imposes a strict diet plan because she is worried about his health since he is overweight and out of shape.

In a short resolution to season three's cliffhangers, it turns out that Garcia and Dangle are pulled out of the car safe (and naked), and, unfortunately, the call placed to the prison was a wrong number, so Craig is killed.
Six months later, Wiegel comes back from her "personal leave" pregnant. It turns out that it was not Craig that impregnated her, but rather via a sperm bank that Junior and Dangle may or may not have contributed to.
Also, Carrot Top goes insane in a Harrah's hotel, throwing furniture out of the presidential suite, shooting at people and stealing police cars.

When Brock is reactivated by the Office of Secret Intelligence to track down a rogue agent, he subcontracts his malevolent ex-girlfriend, the mercenary Molotov Cocktease, to protect the Venture compound from enemies within and without. Love is in the air! Or is it...murder?

Tom Ford tries out the Audi TT and Jason Plato puts his driving skills to the test on Britain's bendiest road. Vicki Butler-Henderson takes Ford's seven-seater MPV for a spin and attempts to get into the record books with a group of pensioners, while Tiff Needell and Dakar racer Simon Pavey attempt to find out which is faster off-road - a 4x4 or a motorbike.