With a tyrannical new teacher seizing control of Hogwarts and suppressing news of an enemy's return, Harry Potter secretly teaches his friends defensive spells.
A wizard and his friends stumble upon a peculiar manuscript that belongs to the "Half-Blood Prince" and may reveal the early days of his powerful enemy.
The Dark Lord's war spreads across the world, and Harry, Hermione and Ron search for the pieces of his soul, which must be destroyed to stop the immortal enemy.
As Harry, Ron and Hermione continue their search for the three remaining Horcruxes that make Lord Voldemort immortal, the Dark Lord plans an attack on Hogwarts.
Michael acts on horrible advice and brings a stripper to a wedding shower being held in honor of Phyllis; Karen talks with Pam about her relationship with Jim.
Phyllis quickly regrets her decision to allow Michael to participate in her wedding after he repeatedly embarrasses her; Pam remembers her own wedding plans.
Ryan asks Michael to come to his business school as a guest speaker; when a bat gets loose inside the office, Dwight goes into combat mode; Pam's art show.
While attending a business party, Michael and Jan admit their relationship, and Jim encounter's Karen's ex-boyfriend; everyone else decides to go to happy hour.
Darryl holds a meeting with Michael to discuss the opportunity for a pay raise; after Pam makes her confession to Roy, Jim is left to deal with the outcome.
Andy returns from anger management with a new outlook on life; Michael and Dwight begin teaching safety lessons to their co-workers to prepare them for danger.
An offensive watermark affects a large shipment of Dunder Mifflin paper and causes commotion in the office; prom invitations were printed on the paper.
Big returns to New York to have an angioplasty, sparking old feelings from Carrie; Smith tells Samantha he loves her, and she decides things could be worse.
Carrie meets a famed Russian artist and falls prey to his charm; Miranda confesses her feelings to Steve; Charlotte has another setback in conceiving a child.
Samantha puts her relationship with Smith on the line; Steve moves in with Miranda; Carrie decides to sleep with Aleksandr; Charlotte donates her time.
Petrovsky drops the bombshell to Carrie that he does not want any more children; Samantha goes to a top female doctor; Miranda and Steve take their honeymoon.
Samantha bravely shaves her head after chemo leaves her with pieces falling out; Steve and Miranda buy a house in Brooklyn; Charlotte adds to the family.
Battling rumors that Smith is gay, Samantha "leaks" a tape to the press in which both of their sexual preferences are very clear; Petrovsky is very stressed.
Carrie is feeling cut off from her own reality in Paris; Charlotte sets up a meeting between her, Big, Miranda and Samantha to help Big get Carrie back.
Wondering if Petrovsky will ever put her first over his art, Carrie begins to think she made a mistake in coming to Paris; Smith tells Samantha he loves her.