Max and Caroline’s attempt to break Nash into the modeling business comes to a screeching halt when his mother arrives from Ireland to retrieve her son.

Norman spends the day with a surprise visitor. Norma attempts to keep secrets from being revealed.

When Sid Ross, the powerful creator of a long-running sketch comedy show is killed, Castle and Beckett are called to investigate. But as they delve into the victim's life and the colorful world of “Saturday Night Tonight,” they uncover a shocking secret that may explain Sid's murder.

As Gotham City’s gang war reaches its boiling point, Fish Mooney goes head-to-head with Maroni and Penguin in an attempt to re-stake her claim on the city. Meanwhile, Barbara and Leslie Thompkins are brought together after recent events, and Bruce searches Wayne Manor for any hints that his father might have left behind.

Jane is nervous to attend her five year high school reunion because she feels her life is not what she expected it to be. Rafael confides in Petra about Jane’s custody request, making Petra think she can fix the problem and become the hero. Xo is confused about Rogelio’s reaction during their show rehearsal until she learns the real reason behind it. Jane agrees to attend Michael’s commendation ceremony, but she has a few ground rules.

CBS special looks back at Letterman’s notable guests such as Tom Cruise, Bill Murray and Robin Williams. Hosted by Ray Romano — who told viewers “I wouldn’t be here if it wasn’t for David Letterman” — the show took a look back at the 6,028 episodes that Letterman has hosted over the years.

Episode info coming soon ..

The investigation leads the team to a dangerous serial killer linked to Theo, while Theo and Penny seek refuge from an unknown source with the means of helping them disappear. Meanwhile, Ryan struggles with recent events, sending him into a downward spiral, and the search continues into which agent has been accessing Daisy’s laptop from inside the FBI.

TC introduces the night shift team to his MMA group therapy leader Colonel Elwood "Smalls" Green (guest star, country music legend Trace Adkins), who surprises the group with special greeting from the White House. Jordan and Paul help a nine-year-old boy with a serious fever. When his high-strung mother begins to exhibit signs of distress as well, the team realizes there is more to the family dynamic than meets the eye. Topher is faced with a big decision about making an emergency trip overseas to help an old mentor. TC grapples with whether to accompany him on the journey. Meanwhile, Ragosa, Drew and Krista compete for the strangest cases of the night as the full moon brings out the worst in people.

Jack Black (Bad Bromance (2015)); author Melissa Rivers ("The Book of Joan"); Jeff Garlin (The Goldbergs (2013)) performs stand-up.

The Top 6 perform two songs each, hoping for America's votes and a trip to the semifinals.