Troy Ruptash

Michael seeks revenge against Whistler and Gretchen and uncovers unbelievable news; Lincoln and Michael are reunited with the gang and get an offer from a Homeland Security agent; Mahone experiences a devastating loss; T-Bag is deserted.

Gabrielle tries to keep Grace in her life; Renee shares a dark secret with Susan; Paul's plan is revealed.

The death of a young botanist leads the CBI team into the lucrative world of medical marijuana, while Cho’s work with the rapid response team brings him back into contact with his former girlfriend and confidential informant, Summer Edgecombe (returning guest star SAMAIRE ARMSTRONG).

A painful bone-marrow test reveals that Scott's cancer has returned. Hathaway solicits the staff to get tested as possible bone-marrow transplants. Carter visits Chase at the neurology center.

As mobster Nicky Augustine (guest star Mike O’Malley) targets Winona (Natalie Zea) in order to convince Raylan (Timothy Olyphant) to turn over Drew Thompson, Boyd (Walton Goggins) and Ava (Joelle Carter) devise a clever ruse to dispose of a corpse that connects them to a murder.

The team looks for a motive when a senator's daughter is attacked; a co-worker gives Kensi a perfect gift.