Katie throws a surprise party for Oliver's birthday after he asks for no party.

When the body of an old man is found inside an acid dump site, Booth, Brennan and the squints find themselves deep in retirement home drama.

An attorney for one of Bull’s former clients, Liberty Davis, asks him to consult on a couple’s civil suit against a teacher who had a sexual relationship with their son. However, his trial strategy suffers a major setback when the teen switches to the teacher’s side.

Severide agrees to a bone marrow donation but a work accident throws everything into flux. Casey and Dawson try to find harmony at home. Meanwhile, Otis and Mouch decide to film a PSA encouraging people to join the Chicago Fire Department but hit a creative wall in the process.

Coulson and Mack discover a shocking secret about Mace, which leaves all of S.H.I.E.L.D. in a dangerous position.

After Gibbs spots the brother of an "NCIS Most Wanted" suspect, he immediately assumes his former alias and goes undercover with their infamous anti-government militia. Also, Bishop and Reeves partner on an off-the-books investigation.

Sebastian is sent undercover and Patton exercises his former gambling skills, as Pride and the team attempt a dangerous operation to trap Garcia.

As Jess tries to find a new vice principal, she discovers that she has a real problem when it comes to making decisions. Meanwhile, Cece enlists Jess and Reagan to help her recruit new models, and the guys are in for a surprise when they enjoy a day at the spa.

David and Stevie must come to terms with their new relationship, while Alexis and Moira become anxious when they schedule a rare mother/daughter lunch.

Bob Lee, Julie, Nadine and Isaac work together to breach the Russian embassy, save Mary, shut down the conspiracy and prove Bob Lee innocent.

Axl begins to panic when he realizes that he only has four months of college left before he graduates, and he hasn't sent out any job resumes - something he should have started when he was a junior. Meanwhile, Brad agrees to lead Sue's no-cut a cappella group as they enter a music competition, and Brick desperately asks for Frankie and Mike's advice when girlfriend Cindy tells him that he reads too much, and if he doesn't stop, she'll break up with him.

After Kenny and Brett officially become a couple, Kenny starts to think of plan on how he should break the news to his parents. Meanwhile, Jimmy surprises everyone when he scores a high SAT score, forcing Eileen to hold up her end of a deal that she had previously made and takes Jimmy car shopping.

Episode info coming soon ..

As the birth date of her triplets quickly approaches, a frazzled and emotional Rebecca forgets Jack's birthday. Dr. K struggles with the loss of his wife and wonders how he'll be able to continue on with his life without her. Joe - the firefighter who delivered baby Randall to the hospital - fights to save his marriage.

Milo takes a deep dive on Jack's birthday; the cast talks about favorite scenes from the series so far.