Harvey has to call in an old debt for the firm. Mike goes toe-to-toe with an unlikely opponent. Louis comes to terms with his new role.

Mike proposes a power move to boost business; Harvey's past causes complications; Rachel's father wants to join forces; Louis mentors Brian.

Mike juggles his work obligations with his promise to help a family; Harvey asks for Louis's discretion in a sensitive matter; Donna vets a possible addition to the firm.

Louis and Harvey wrangle with new firm dynamics. Mike's latest success brings him unexpected new business. Rachel's leadership is challenged by an insubordinate associate.

Harvey and Louis fight to protect the future of the firm from its past; Alex worries Mike's instincts could risk a client relationship; Donna and Harvey delve into the aftermath of their kiss.

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.

Harvey, Louis and Donna must get on the same page - and fast - when Bratton Gould comes after PSL for poaching an attorney. Mike and Rachel struggle to make time for their wedding plans.

Mike deals with the blowback on his prison case; Harvey tries to tell Donna about his relationship with Paula; Louis' past behavior comes back to haunt him.

Following the merger, Harvey and Zane grapple over who should lead the firm. Louis tasks Katrina with culling the herd, but doesn't like her decision. Donna helps her see beyond the numbers.

The transition continued to cause headaches as Harvey and Donna get their first taste of how Samantha operates and Alex tries to impress Robert Zane.

Harvey helps Samantha settle an old score. Louis faces a hurdle on the path to fatherhood.

Jessica hopes Harvey's promotion will reign him in, but when a crisis arises with the first client he brought into the firm, Harvey goes rogue trying to fix it.

Mike's life becomes complicated when an old friend reappears and needs his help. Harvey must decide between closing a multi-million dollar deal and helping his trusted driver defend himself against a law suit.

Harvey and Mike work to save a woman wrongly accused of insider trading. Mike helps Rachel study for the LSAT, only to find out she is on the brink of discovering his closely guarded secret.

Mike is tasked with reigning in a modern day Robin Hood whose illicit deeds are putting a client's business at risk. Also, Louis must resolve his differences with Harvey to win a case. Amanda Crew and Bruce Altman guest star.

Harvey butts heads with his partners over a bold move. Mike pursues a pro bono case with the legal clinic. Donna's actions raise tough questions at the firm.

Mike's attempt to distract Harvey with a case backfires. Louis tries not to let emotion affect his judgment in a legal duel. Donna finds a way to prove her worth to the firm.

Harvey is forced into a difficult decision when the impossible is asked of him. Mike and Rachel try to make time to discuss their future. Louis struggles with the rules of his relationship.

An old foe backs the firm into a corner. Samantha and Alex try to broker a peace between clients.

Mike has an ethical dilemma when Louis forces him to make a decision that could hurt his relationship with Harvey. Elsewhere, Harvey's past comes back to haunt him during a case.

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.

Harvard ethics professor Henry Gerard seeks Harvey's help with a case that requires a lack of ethics to win. Mike, meanwhile, does his best to not be spotted by the professor, whose class he never took; and Louis tries to wine and dine a socialite CEO.

Harvey and Mike seek outside help; an unexpected encounter derails Louis' search for a new associate; Donna receives a proposition.

Harvey’s good deed puts him on a collision course with the firm’s landlord, David Fox. Alex pursues Samantha's former client. A medical condition jeopardizes Katrina’s shot at Senior Partner.

Alex is caught between Harvey and Zane as Louis struggles to overcome a shocking setback.