On tonight's NCIS: Los Angeles, Sam and the team have to decipher a code to solve a mystery. When they do, it turns out to be a huge threat to national security.
On tonight's NCIS, Gibbs tracks down his namesake to find out why he left decades before. Will Gibbs be able to mend the relationship between his namesake and his father?
On tonight's The Good Wife, Diane and Alicia have to prove a university is responsible for the death of their client. Will they be able to outmaneuver their opposing counsel?
On tonight's The Big Bang Theory, Howard returns from space to an unexpected welcome. And the guys and girls face off during game night. Who will come out on top?