Following his breakup with Tara, Louis starts terrorizing the associates. His behavior raises red flags with Rachel, Donna, and Gretchen. Donna has figured out that what she wants is a seat at the table as senior partner. She uses the situation with Louis to prove to Harvey that she deserves it after all these years of being a key person in running the firm without getting the credit. Harvey agrees to name her senior partner but has to tiptoe around telling Louis. After Rachel convinces Louis that he needs closure with Tara, he allows Rachel, now a lawyer as well, to step up and take over the associates from him. Meanwhile, Mike and Harvey team up again to prove to one of Jessica's clients that the firm can handle his case now that Jessica is gone. Harvey has a hard time filling Jessica's shoes and reconnects with his former therapist, Dr. Paula Agard, to pursue a romantic relationship. Mike gives the legal clinic half a million dollars, but his returning to PSL doesn't sit well with his former colleagues, especially Oliver.
Donna Paulsen asks Harvey Specter to make her a senior partner at the firm despite not being a lawyer, and pays the $500,000 partnership buy-in.
Mike Ross takes over Harvey's old office and Donna gets Mike's old office while Harvey moves into Jessica Pearson's office.
Louis Litt takes his aggression over on the associates, prompting Donna and Rachel Zane to worry that the associates will sue. Rachel and Donna have Louis removed from his position, making Rachel the new head of the associates.