EXCLUSIVE: Lucy Lawless Breaks Terrifying News on 'Salem'!

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Things are about to go from bad to worse on Salem. 

WGN America's spooky witch drama airs an all-new episode this Sunday and ETonline has your exclusive first look at the action-packed hour featuring a crackling scene between Mary Sibley (Janet Montgomery) and Countess Von Marburg (Lucy Lawless).

PHOTO: Get Your Eerie First Look at Season 2 of 'Salem'

Mary realizes that she may have a new ally in English doctor Samuel Wainwright (Stuart Townsend), but there's just one problem: her young son, Little John (Oliver Bell) has gone missing. 

In the sneak peek, Von Marburg assures a distraught Mary that "our little lamb is safe and sound," but obviously that's not good enough. "Tell me what you've done with him or I will rip the truth out from your heart," Mary demands.

Turns out, there's a far greater reason for why Von Marburg has kidnapped Mary's son -- and it has to do with the "greatest of all sacrifices."

Watch the rest of the scene to find out how Mary takes the terrifying news. 

Salem airs Sundays at 10 p.m. ET/9 p.m. CT on WGN America.