The evil infiltrating Sleepy Hollow will receive a name in next week's episode, "The Lesser Key of Solomon."

While it remains unclear whether or not viewers will find out the name of the demonic looking "Blurry Man," a new, human sect of baddies will be introduced.

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The Hessians, known in American history as German mercenaries who served Britain during the Revolutionary War, will arrive on the scene and it appears they have a more malicious past than originally thought.

"There's a secret underground cult of Hessians that has been imbedded in Sleepy Hollow," said executive producer Alex Kurtzman in a new sneak peek. "They're carrying out part of a much bigger plan."

Part of this plan involves tracking down Jenny Mills (Lyndie Greenwood), Abbie's (Nicole Beharie) sister who has recently escaped from a psychiatric hospital. The other piece of their evil agenda involves opening a doorway to 72 condemned souls.

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The series' fourth episode will also reveal the true motives behind the colonists' Boston Tea Party in 1773. Apparently the famous protest was a ploy to cover up the revolutionary's attempt to steal something from the British Army.

Catch Sleepy Hollow's "The Lesser Key of Solomon" next Monday night at 9 p.m. ET on Fox.

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Sleepy hollow, Nbc, Television