Troy Ruptash

While the Russian government claims an explosion in its country occurred at an oil refinery, evidence proves it happened at a nuclear facility.

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).

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.

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 where Chase remains unable to speak.