Nick wonders if aliens exist within the Wesen world in this new episode. His latest case involves mysterious cow mutilations and reports of glowing creatures. At the same time, Juliette begins to have romantic memories of Nick. NBC/CTV, 8 p.m.
In the season-finale episode Brothas and Sistas, Jane is given the task of planning the perfect wedding for her older sister, Brooke (Stephanie March). Dave and Alex try to protect a big secret. ABC/Citytv, 7:30 p.m.
After several acclaimed seasons in the premium-cable realm, this award-winning HBO drama arrives on Showcase. Steve Buscemi plays underworld icon Nucky Thompson, who rules Atlantic City during the Prohibition era. Showcase, 9 p.m.
Jay Leno: Robert Downey Jr., Avril Lavigne
David Letterman: Jon Hamm
Craig Ferguson: Robin Wright, Andy Dick
Jimmy Fallon: Amy Poehler, Michael Angarano