Ian Casselberry

Upton (Tracy Spiridakos) brings back an old undercover identity to help take down a meth ring spearheaded by a former criminal contact. And with pressure from Woods (guest star Mykelti Williamson) mounting, Voight (Jason Beghe) calls in a favor for Olinksy (Elias Koteas).

When a Navy Admiral’s daughter is the prime suspect in a double murder case aboard a research boat, the NCIS team partners with the Coast Guard Investigative Service (CGIS) to work the case. Meanwhile, Lasalle tracks down his estranged brother.

Rick and the group realize the only way to maintain the peace of Alexandria is to fight a new enemy. This time, though, our group might be outmatched.

Davis concocts a remedy for the post-Mardi Gras blues; Annie makes a decision that Sonny takes personally; Janette's latest chef's gig gets bogged down; Antoine becomes LaDonna's unexpected benefactor; Colson warns Albert to avoid trouble on St. Joseph's night; Creighton is inspired by a classic novel set in old New Orleans.

When Kara and Alex investigate the murder of an unregistered alien, the trail leads to an alien fight club run by Roulette (guest star Dichen Lachman), the ringmaster who commands aliens to fight in mortal combat for the entertainment of rich humans. While trying to stop the fighting, Supergirl and Martian Manhunter find themselves up against a surprising opponent. Meanwhile, Hank is thrilled to have found another Martian and tries to get to know M’Gann (guest star Sharon Leal) better. Supergirl takes Mon-El under her wing and begins to train him.