What to Watch: Wed, October 24

Arrow
8 p.m., CTV & The CW
When Deadshot (guest star Michael Rowe) begins killing men who are all bidding on an energy company, Oliver teams up with Detective Lance to stop him before he sets his never-miss sights on Walter.

Perception
6 p.m. & 11 p.m., Bravo
Daniel is forced to confront his past when he and Kate investigate the murder of a college student who was killed in her own dorm room.

Paranormal Witness (Season Finale)
7 p.m. & 11:30 p.m., Space
Unlike many ghostly re-enactment shows, Paranormal Witness backs up its chilling testimonials with genuine, film-quality shocks. The season-two finale airs tonight, provided you can bring yourself to peek out from beneath the covers.

Titanic: Blood and Steel
9 p.m., CBC
When Emily’s brother is fired, he finds solace with the violent Fenian Brotherhood. Meanwhile, Pirrie shoots down Mark’s suggestion to construct a double hull on the ship.

Placido Domingo: My Greatest Roles
9 p.m. & 1 a.m., Knowledge
In this 2009 retrospective special, the famed tenor looks back over a career of spectacular performances in some of the world’s finest operas. Included in this program is footage from Carmen (Vienna Opera); Otello (The Royal Opera House in Covent Garden); and Samson and Delilah (San Francisco Opera).

Supernatural
9 p.m., CHEK & The CW
In this unusual episode, the stars play second fiddle to three young sleuths who are investigating strange animal attacks in their small town. After finding a laptop while investigating a crime scene, Sam and Dean mostly just kick back and enjoy the show — just like viewers do when they tune in to watch.

Modern Family
9 p.m., Citytv & ABC
Claire is forced to rein in her penchant for overdoing it on Halloween when her neighbours insist she tone down the scariness and try to keep everything “kid-friendly.” Meanwhile, Gloria’s pregnancy hormones make her even more hotheaded than she usually is.