What Do the Travelers Want With Elena and Stefan’s Blood?

There was a lot of Traveler talk in last night’s episode of The Vampire Diaries about the doppelganger blood of Stefan (Paul Wesley) and Elena (Nina Dobrev), and this isn’t the first time the Travelers have gone out of their way to get their hands on the stuff. In the 100th episode, they trapped Stefan and Elena in some shack until they had both contributed a bucket-full. What do the Travelers need with all that doppelganger blood?

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