Things will heat up and someone will die in Thursday's episode of "Once Upon a Time in Wonderland" on ABC.

In a video promo for Episode 11, which is entitled "Heart of the Matter," Alice and Cyrus search for the heart, the only thing that can save them. Plus, Jafar will threaten to kill the Red Queen if he doesn't get his hands on the heart.

According to a press release, the synopsis of the upcoming episode states, "Alice and Cyrus discover alarming information involving prisoners Jafar has under his control and changes their priorities. Meanwhile, the Red Queen is in critical danger and no one can help her except the Knave by surrendering information to Jafar that he's been desperately seeking. In flashback, Anastasia is about to marry the King and strikes up a friendship with Cora that directly impacts Will. Cora also confronts Will resulting with him asking her for a shocking demand.

"In a flashback, we dig deeper into Anatasia's past. The flashback was when Anatasia was about to marry the King. She also befriended Cora, which directly affects Will. Cora also confronted Will, which resulted with him asking for a shocking demand."

Barbara Hershey will make her debut on the show in character as Cora, reports TVLine. In addition, other guest stars will also appear in the "Heart of the Matter," including, Iggy Pop as the voice of the Caterpillar, Trevor Lerner as Burly Guy, Matty Finochio as Tweedle #1, Ben Cotton as Tweedle #2, Peta Sergeant as Jabberwocky, Brian George as Old Prisoner and Michael Jonsson as King's Guard, reports Hollywood Hills.

"Once Upon a Time in Wonderland" S1E11, "The Heart of the Matter," airs on Thursday, March 20 at 8 p.m. EST on ABC.