In the fourth-season finale, Raj moves in with Sheldon when Leonard and Priya’s “Star Trek” bedroom fantasy is too much for him; and the guys tease Howard when Bernadette gets her PhD, making Howard the only one without a doctorate

After quitting his job, Fry joins the police department and is assigned to the Future Crimes Division.

Hanna assists Lucas with his dating life. Meanwhile, some of Aria’s buried memories resurface when she runs into Jason; Spencer worries about Melissa’s secretive exchanges with Ian; and Emily’s mom can’t keep the scholarship news a secret.

In the eighth-season finale, Haley and Brooke get ready to operate Karen’s old café. Elsewhere, Nathan and Clay scout for new clients; Chase takes off for the Air Force; and Mouth and Millicent start cohosting a new morning show.

Season 7 finale: Meredith’s deceit in Derek’s clinical trial comes to light, jeopardizing her career and causing unintended consequences for others. Meanwhile, Owen announces his choice for chief resident; and Cristina and Teddy have choices to make.

In the fourth-season finale, Blair has a difficult choice to make. Meanwhile, familiar faces return to town, including Georgina, Kati and Isabel. “Gossip Girl” author Cecily von Ziegesar guest stars; and Airborne Toxic Event perform.

Nancy tries to adjust to life in New York City and gets a surprise when Andy and Shane, whom she thought were in Copenhagen, unexpectedly show up at her door. Elsewhere, Silas attempts to land a job as a model, and Doug pays a visit to an old friend.

In the sixth-season finale, Ted is the best man at a wedding that changes his life; Marshall fears that he may become the victim of food poisoning; and Barney and Robin bond.