When a summer heat wave blasts Toronto, many citizens head to the beach for relief in this new episode. A body marked by what appears to be a large bite washes ashore and the city is soon on fire with rumours of a sea monster. CBC, 7 p.m.
The competition reaches a new milestone as the top-10 vocalists perform for judges Adam Levine, CeeLo Green, Christina Aguilera and Blake Shelton in this two-hour edition. The performers sing their hearts out in the hopes of capturing America's vote. CTV, NBC, 7 p.m.
Lyndie Greenwood guest stars as Jenny Mills, who joins forces with Ichabod (Tom Mison), Abbie (Nicole Beharie) and Capt. Irving (Orlando Jones) to battle the Headless Horseman. Also, Ichabod is surprised by information about the Horseman's true motive. Fox, Global, 8 p.m.
David Letterman: Vince Vaughn, Luscious Jackson
Jay Leno: Whoopi Goldberg
Jimmy Kimmel: Barbara Walters, Josh Gad
Craig Ferguson: Kunal Nayyar
Jimmy Fallon: Bill Cosby, Brad Whitford
Jon Stewart: Elizabeth Olsen
Steven Colbert: Steve McQueen