Worth watching

9 p.m. (Ch. 5) 24: Live Another Day If things are never easy for Jack Bauer (Kiefer Sutherland) on this show, they’re frequently tough for its women, too. That’s confirmed by the new episode “Day 9: 8:00 PM-9:00 PM,” as Kate (Yvonne Strahovski) is shocked by information about her husband. Audrey (Kim Raver) also has spousal concerns and goes straight to the source — her mate, Mark Boudreau (Tate Donovan).

10 p.m. (Ch. 2) Under the Dome Last summer’s drama, which revived the concept of the TV miniseries, starts season two with an impressive writing credit. Stephen King, author of the novel the show is based on, wrote the script for “Heads Will Roll.” He also has an cameo in the episode, which makes Barbie (Mike Vogel) dependent on Big Jim (Dean Norris) for his survival. Actually, the fate of everyone under the dome is in question when it suddenly becomes magnetized. Rachelle Lefevre also stars.

10:01 p.m. (Ch. 7) Mistresses A new recklessness displayed by Savi (Alyssa Milano), resulting from her secret alliance with Zack (guest star Jason Gerhardt), concerns her loved ones in the new episode “Playing With Fire.” Joss and Scott (Jes Macallan, Justin Hartley) get closer.