Cyberbully (8pm, ABC Family) - A teenage girl (Emily Osment) falls prey to online bullying and retreats from spending time with her family and friends. Soon the tormenting pushes her toward the edge, and her mom takes the issue to the authorities.
Masterpiece Mystery: Zen (9pm, UNC-TV) - Suave police detective Aurelio Zen (Rufus Sewell, left) reinvestigates a closed murder case. His boss insists he confirm the original outcome while a justice official orders him, for political reasons, to reach another conclusion. Meanwhile, a psychopathic killer has targeted him for daring to send him to jail years earlier.
True Blood (9pm, HBO) - Alcide joins Sookie in her search for Eric and Jason pleads for his freedom from Hotshot.
Drop Dead Diva (9pm, Lifetime) - Jane is mugged while picking up Grayson's wedding rings and later ends up representing the gunman.
The Glee Project (9pm, Oxygen) - "Glee" star Darren Criss serves as the mentor when the contenders sing duets to test their ability to collaborate.
Falling Skies (10pm, TNT) - Another resistance leader appears at the camp, sounding an alert that the aliens will soon attack and offering to take the children to safe shelter. With time running out, Tom and the others must decide whether to send their children ahead or hold them back to withstand a possible attack.
Breaking Bad (10pm, AMC) - In the Season 4 opener, Walt and Jesse's lives hang in the balance as Gus takes some expensive steps to guarantee that he continues to be supplied with a pure product. Meanwhile, Marie tries to put on a happy face to deal with depressed Hank. Here's our review of tonight's terrific episode.
Marriage Ref (10pm, NBC) - The only thing entertaining about this show is when the guest panel goes on a funny riff about something. At least part of tonight's panel holds promise: Seth Meyers, George Wallace, and Denise Richards.
Curb Your Enthusiasm (10pm, HBO) - Leon endures a case of mistaken identity. Also, Larry helps women in abusive relationships and Richard Lewis gets involved with a burlesque performer.