Harvey’s defense of Ava hits a roadblock when the interests of her murder trial are at odds with Louis’ work to thwart a hostile takeover of Hessington Oil by a rival businessman.

An old nemesis returns; Harvey and Scottie are on opposing sides again; Louis ends up in Sheila's crosshairs; Mike and Rachel are under Jessica's scrutiny.

A major client demands that Harvey and Mike perform an unpleasant task; Louis faces a difficult challenge; Rachel collects an old debt.

A persistent attorney goes after one of Harvey's clients; Mike is faced with a difficult decision; former name partner Charles Van Dyke returns with revenge on his mind.

Mike and Harvey adjust to their new paradigm. As they butt heads over strategy in Mike’s first foray into investment banking, their new attorney-client relationship may be short-lived. Meanwhile, Pearson Specter discovers that a disgraced former District Attorney may be pursuing a vendetta against Harvey and the firm.

Harvey and Mike find themselves on opposite sides of a takeover battle that threatens to turn into a knockdown, drag-out fight – a fight complicated by Rachel’s relationship with Mike. Meanwhile, Louis finds himself partnered with recent SEC defector Jeff Malone in defending Pearson Specter from disgraced DA Eric Woodall.

Having lost his partner on the inside, Mike moves to a hostile takeover of Gillis Industries. On the other side, Harvey and Louis pull out all the stops to make sure they win this takeover fight, and things take a personal turn. Meanwhile, Jessica and Malone come face-to-face with Sean Cahill, the attack dog with the weight of the SEC behind him, bent on bringing The Firm down.

Rachel becomes increasingly anxious about work, school, and the growing attraction between herself and Pearson Specter client Logan Sanders. Meanwhile, Louis helps Donna prepare for a major role while she encourages him to face his fear. Harvey and Mike agree to a ceasefire, but Sam accuses him of collusion and Mike learns how ruthless his new partner can be.

When Sean Cahill brings Pearson Specter client Logan Sanders in to the SEC for questioning, Harvey tries to put an end to the Gillis Industries takeover. But when Mike continues to play hardball, Louis sees an opportunity to make a name for himself by saving the day. Meanwhile, Rachel must contend with the fallout of a moment of weakness.

Rachel brings disturbing news while Mike is still reeling from the aftermath of the battle for Gillis Industries. Feeling Harvey is his only friend left, Mike makes a rash decision. Meanwhile, Jessica asks Louis to pick his own reward after his victory for the firm.

Jessica thinks that Harvey is putting out his "Donna anger" on Louis, as an ambitious senior partner tries to take on Harvey's salary. Rachel's dad insists that Mike and Rachel sign a prenup.

Rachel and her mother, Laura Zane, plan for Rachel's dream wedding, but Rachel fears the event may reveal Mike's secret. Meanwhile Daniel Hardman and Jack Soloff make their move against Jessica and the partners, as Harvey and Mike tangle with Hardman's mysterious backer, and Louis tries to find Jack's Achilles heel.