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 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.

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.

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.

Season Finale. It's all hands on deck as Louis, Donna and Alex defend the firm, while Harvey aids Jessica on a case; Mike and Rachel juggle their commitments to the firm, the clinic and each other.

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’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.

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

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

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

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

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

When Harvey and Zane can't stay on the sidelines, Donna does what's best for the firm.

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

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

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

Harvey's forced to choose a side when Samantha and Scottie go toe-to-toe. Louis represents Lipschitz.

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

When Hardman comes looking for retribution, the firm rallies to Harvey's defense.

Harvey and Samantha fight to keep Zane's name on the wall. Alex warns Louis of the consequences.

The firm faces the repercussions of its actions. Samantha enlists Katrina to help an old friend.

Harvey takes a case to send Faye a message. Louis finds a new opportunity.

Faye decides to take action against Harvey and Donna's relationship. Harvey looks to impress Donna's father.

Samantha finds herself caught in the middle of a tricky situation when Mike picks a fight with Harvey.

Harvey makes a play to get Samantha's job back. Katrina faces off against an old friend.

Harvey and Samantha head out on a road trip together. Louis gets in over his head with a potential client.

An old foe forces Harvey to account for past actions. Esther has a problem only Louis can solve.

Mike helps Harvey overcome a personal loss and an attempt to take down Faye grows more complicated than what was originally anticipated.

Facing its potential destruction, the partners must go all in to save the firm.