TV Guide 5USA Tuesday

An army scientist goes missing, so Abby is asked to temporarily replace him on a top-secret research project - but Gibbs later learns her assignment is connected to a current murder investigation, and worries she may meet the same fate as her predecessor. Mark Harmon and Pauley Perrette star

Part one of two. When the body of a marine is found strung up at a construction site, the agents travel to LA to work with another NCIS team on an investigation into an international arms deal that escalates into a high-priority case, and Tony begins to pry into Ziva's life. Guest starring Chris O'Donnell and LL Cool J (NCIS: Los Angeles)

Part two of two. Agent Callen poses as an arms trade contact in a bid to catch killer Michael Aaron Rivkin. Meanwhile, Tony fears Ziva may not be loyal to the team, and a psychologist uncovers the truth about the relationship between Gibbs and Agent Macy. With Chris O'Donnell, Louise Lombard and LL Cool J

Briscoe and Green believe the fatal stabbing of psychologist Tracy Conley may be linked to confidential client information on her computer. They learn one of the files on her hard drive has been tampered with since her death - information that would have ensured a known rapist spends another five years behind bars. Award-winning police drama, starring Jerry Orbach and Jesse L Martin

When an 11-year-old girl is found suffocated to death in Central Park, Briscoe and Green discover her adoptive mother's attempts to discipline the child may have inadvertently caused the tragedy. However, the case is thrown into confusion when a post-mortem reveals she may actually have died of an allergic reaction. Police drama, starring Jerry Orbach and Jesse L Martin

A high-school student is found dead in an apartment building, and Briscoe and Green suspect an improper website may have played a part in her murder. As McCoy and Southerlyn investigate the case further, they realise the victim's best friend, who was reluctant to come forward as a witness, may provide the answers. Police drama, starring Jerry Orbach, Jesse L Martin and Elisabeth Rohm

Briscoe and Green are assigned to investigate the execution-style killing of a prominent businessman, and discover his wife was having an affair. However, further evidence emerges, suggesting a different motive - and an unlikely conspirator. Award-winning police drama, starring Jerry Orbach and Jesse L Martin

Briscoe and Green look into the shooting of defence lawyer Vance Grodie, who had just won an acquittal for a suspected cop killer. Their investigations reveal a link to a network of conservative extremists, and the discovery leads the case into an examination of civil rights. Police drama, starring Jerry Orbach and Jesse L Martin

A baseball star becomes the prime suspect in the murder of his limousine driver, who had been regularly supplying him with steroids. Briscoe and Green's investigation reveals blackmail as the underlying motive for the crime. Jerry Orbach and Jesse L Martin star