New Year’s Eve 1989. It’s Mo’s "wedding day," but priority number one is to make sure he and his crew live to see another decade. He and Dawn, Blair, Keith and Yassir work together to do whatever it takes to make sure that happens. Season finale.

Mo is determined to make Blair and Tiff’s marriage happen, for better or worse. Keith tries to impede the SEC’s sting operation by any means possible.

Everything comes crashing down.

Mo tries to extricate Keith from a difficult situation.

It’s 1989 and Mo makes his first big “discovery” as a newly minted jazz producer. Dawn’s still serving time for masterminding Black Monday, Blair learns the hard way how to play politics, and Keith discovers that the late Lenny Leighman has some big follicles to fill. Mo hatches a plot to get Dawn an early release.

The group is thrust (literally) back together in a black-site interrogation turned group-therapy session.

A new client presents a moral quandary for Dawn. Mo, Blair, and Keith chase down leads while Tiff has an identity crisis.

On election night, Blair makes a risky proposition while Mo and Dawn go on a double date. Keith makes a startling discovery.

At TBDs Halloween party, Blair tries to make the trade of a lifetime, Mo and Dawn argue over an opportunity, Tiff and Corkie loosen up, and Keith phones a friend.

Blair is forced to revisit his past while Mo, Keith and Dawn try to make amends.

A plan comes together. Season finale.

Mo attempts to create a father/son bond with Blair. Dawn and Spencer have a lively dinner with Dawn's parents. Keith finds his secret increasingly difficult to hide.

Mo and Dawn attempt to reunite Blair and Tiff in order to keep the Georgina play afloat. Mo's debts come back to haunt him.

At Blair and Tiff's engagement party, Mo's feelings for Dawn begin to cloud his judgment. Wayne and Yassir get into serious trouble, while Keith takes a big step.

We get a glimpse into Mo’s past, while Blair and Dawn pursue some necessary detective work.

Dawn puts on a show at her new “job” for her parole officer, while Blair puts on a show for the RNC. Mo makes a big personal announcement, and Keith tries to please Larry. Blair shoots for political points and his electroshock therapist gets a shock of his own.

Mo tries to make his own bachelor party happenin’. A killer is still on the loose and they’ve chosen to celebrate in a cabin…in the woods. Keith enjoys his social status upgrade until someone unexpected returns.

Wide-eyed Blair is thrust into the insane world of ’80s Wall Street. Mo enacts his master plan to take over the Georgina Jeans Company.

Mo takes Dawn to the Predator's Ball in an effort to raise the capital The Jammer Group needs to pay off their debts. Blair is saddled with a weekend work assignment.

Blair's new political connection puts Dawn in a compromising position. Yassir and Wayne attempt to solve an office mystery.

Blair and Dawn take to the skies to pursue a new investor. Mo and Keith struggle with relocation.

Mo tries to keep up with Nomi but he comes to realize that time catches up with us all when he finds he can’t party like he used to. Meanwhile, Dawn’s attempt to get him to slow down backfires. Elsewhere, Pastor Newell’s funeral planning goes off the rails and ends with a bang.

A Hollywood screenwriter shadows Mo at the office as Mo and Dawn fight over her desire to be made a partner. Keith plays a prank on Blair.

Mo takes Blair on his bachelor party, while Dawn realizes she’s a very important guest at Tiff’s bachelorette party. Keith faces a loaded decision.

Dawn readies for her upcoming move to the West Coast, only to find that Mo’s attempt to help her has, yet again, backfired. Blair realizes that the killer is inside the house. Keith needs a job real, real bad.