Tune in to The CW tonight for The Vampire Diaries season 5, episode 3 “Original Sin,” in which we meet the mysterious Tessa.

In the third episode of The Vampire Diaries season 5, we’ll be introduced to Stefan (Paul Wesley)’s unlikely saviour Tessa (Janina Gavankar), who turns out to have a surprising connection to the younger Salvatore brother.

You can catch a sneak peek at her and Stefan’s reunion over at E! Online. And if you want more teasers about what’s ahead, head over to EW for two exclusive video interviews with Paul Wesley and Ian Somerhalder.

Now that Stefan is free, expect a bit of the old Ripper to resurface as he attacks and feeds off a human, as seen in the promo below:

But what with Silas already filling up the evil-Stefan quota, we’re sure Elena (Nina Dobrev) and Damon (Ian Somerhalder) can lure Stefan back to the light.

The official episode description for “Original Sin” reads:

When Elena and Katherine have the same dream that Stefan is in danger and desperately needs their help, they convince Damon to help them find Stefan. However, their plans are thwarted by a mysterious young woman named Tessa (guest star Janina Gavankar) who seems to know everything about Stefan’s history. In flashbacks to a distant time and place, Tessa reveals the shocking secrets in her past and what she has planned for the future. She also has a disturbing message for Damon about his own future. Silas (Paul Wesley) forces an unwilling accomplice to help him search for Katherine, leading to a confusing and life-threatening situation for Matt. Finally, Silas reveals the reason he’s determined to find Katherine, and Damon and Elena face a disturbing new reality.

The Vampire Diaries season 5, episode 3 “Original Sin” airs tonight at 8/7c on The CW.

Don’t forget to check out Hypable.com’s Vampire Hype podcast, which discusses both The Vampire Diaries season 5 and The Originals season 1.