(Eric McCandless/ABC FAMILY)

With Alison as her new roommate, Hanna goes down a dark path, while Spencer and Emily pursue a dangerous lead in their investigation to identify the dead girl in Alison’s grave on “Pretty Little Liars” (ABC Family at 8 p.m.).

An unemployed chef competes against five professionals in hopes of winning $100,000 on “Food Fighters” (NBC at 8). Celebrity chef Cat Cora guest stars.

“Dance Moms” (Lifetime at 9) picks back up in Season 4 with Chloe leading a contemporary piece titled “Light as a Feather, Stiff as a Board” at Sheer Talent in Wheeling, W.Va., and Abby rewarding Mackenzie with a solo against Christy’s daughter, Sarah.

“Healed: Music, Medicine and Life with MS” (MPT at 9) tells the story of cornet virtuoso Jim Klages who after achieving his dream of being named a soloist with the U.S. Marine Band in Washington, D.C., noticed a strange tingling in his arm and was diagnosed with multiple sclerosis.

Twelve of the top 48 contestants perform live at Radio City Music Hall on “America’s Got Talent” (NBC at 9).

SERIES PREMIERE: Another off-shoot of the “Dance Moms” franchise, “Raising Asia” (Lifetime at 10) zeros in on “Abby’s Ultimate Dance Competition” Season 1 finalist Asia Monet Ray, 8, as she competes in world-renowned competitions while her parents struggle with their balancing act.

SERIES PREMIERE: The reality series “Dark Horse Nation” (History at 10) follows the characters who work at the Dark Horse Brewing, which makes beer in Marshall, Mich., and the “renegade entrepreneurialism” of their day-to-day life.

Charleston gets the “Drunk History” (Comedy Central at 10) treatment with Patton Oswalt playing Charles Sumner when he gets caned on the Senate floor and Johnny Knoxville as Preston Brooks, the man who beat him.

“Frontline” (MPT and WETA at 10) investigates the U.S. role in Iraq, from the 2003 invasion to the present, with remarks from the nation’s top policymakers and military leaders on how the nation continues to get pulled into the conflict.

Actors Vin Diesel and Aubrey Plaza are on “The Tonight Show Starring Jimmy Fallon” (NBC at 11:35), with music from Will.I.Am.

“Late Show With David Letterman” (CBS at 11:35) welcomes actors Chris Pratt and Judy Greer, plus music from Rodrigo y Gabriela.

Actors Daniel Radcliffe and Abigail Spencer come to “Jimmy Kimmel Live” (ABC at 11:35), with a musical performance from Kiesza.

Rachel Lubitz