In this rebroadcast of Bite Me: The Bed Bug Invasion, scientists who have been tracking the spread of these tiny blood-seeking pests attempt to explain why they've been impossible to eradicate. As it turns out, the truth kind of, well, sucks. CBC, 9 p.m.
The First 48
A&E brings viewers more real-life crime drama with this new episode, titled Missing. It follows detectives as they attempt to retrace the last known steps of a 20-year-old single mom who has vanished and is presumed to be a victim of foul play. A&E, 8 p.m.
ABC presents back-to-back episodes of the costumed-adventure reality series, starting with the confrontation-filled Under Siege and continuing with the conspiracy-minded A Traitor in Sanctum. ABC/Citytv, 7 p.m.
George Stroumboulopoulos: Chris Hadfield
David Letterman: Mike Myers, John Fullbright
Jimmy Fallon: Halle Berry, Chris Colfer
Jimmy Kimmel: Aaron Paul, Ed Sheeran
Craig Ferguson: David Duchovny, Gloria Estefan
Seth Meyers: Clive Owen, Sarah Paulson
Jon Stewart: Todd Glass
Conan O'Brien: Jason Segel, Cameron Diaz