The alien antics conclude on the season finale of “The Neighbors” (7:30 p.m., ABC). Having recently attended a Broadway show, the gang takes the next logical step for ultimate tourists: a trip to Atlantic City. Frivolity comes to an abrupt end when they receive a call from their home planet.

Is it time to return to Zabvron? That appears to be up to ABC programmers, who have yet to renew or cancel this series. Look for George Takei and Mark Hamill as familiar faces from home.

• Speaking of sitcoms with uncertain futures, “Whitney” (7 p.m. and 7:30 p.m., NBC) also ends its season tonight. In the season finale, Whitney catches her therapist doing something deeply disturbing and begins to question her professionalism.

• An old-fashioned soap opera in all the worst ways, the Canadian series “Bomb Girls” (7 p.m. and 8 p.m., Reelz) enters its second season. Set in a munitions factory during World War II, “Girls” features overlapping stories of high drama, including women worried about their men at the front, an out-of-wedlock pregnancy, a secretive lesbian worried about exposure and blackmail and a rich heiress “doing her part” for the war effort.

The stories might work if the dialogue wasn’t so jaw-dropping and obvious and if “Girls” wasn’t staged as a series of musical fashion shoots interrupted by campy melodrama. Look for Meg Tilly in a starring role as a mother figure in more ways than one. “Girls” is best appreciated as a hoot — a stylish period piece misfire.

Tonight’s other highlights

• Finalists compete on a two-hour “American Idol” (7 p.m., Fox).

• Molly Shannon guest-stars as Frankie’s visiting sister on “The Middle” (7 p.m., ABC).

• A killer targets Roy on “Arrow” (7 p.m., CW).

• A media fixture discovers that she’s pregnant by her rapist on “Law & Order: Special Victims Unit” (8 p.m., NBC).

• A tiff between Claire and Cameron requires intervention on “Modern Family” (8 p.m., ABC).

• “NOVA” (8 p.m., PBS) examines Russian meteor strikes.

• A suspect evades capture on “Boston’s Finest” (8 p.m., TNT).

• Rayna enters the talk show circuit to discuss divorce rumors on “Nashville” (9 p.m., ABC). This is the first original episode to air since February.

• John scrambles to save Hicks on “Southland” (9 p.m., TNT).

— Copyright 2013 United Feature Syndicate, distributed by Universal Uclick.