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.

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.

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.

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 learns the finer points of managing Harvey. Alex is caught between Samantha and his wife.

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

Harvey laces up for a rematch against an old foe. Louis struggles to hold the reins of the firm.

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.

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

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

Harvey and Donna are caught in the crosshairs when Stu is blackmailed; Samantha revisits her past.

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 confronts his personal issues to defend his brother. Louis sacrifices for family.

Donna's agreement forces Harvey to help David Fox. Alex comes to Zane's aid on a personal venture.

Jessica and Harvey have to come up with a defense, even though Mike is guilty. Rachel must come to terms with her family's reaction to the news that her fiancé is not the person he claimed to be - and that he could soon be in prison.

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.

Donna's relationship complicates a deal for Harvey and Alex. Samantha helps Louis get justice.

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.

Harvey and Louis assess their relationship. Donna doubts Samantha's motives for helping her.