In an exclusive clip from Friday's The Originals/The Vampire Diaries crossover, Klaus (Joseph Morgan) introduces Stefan to his "brand new older" sister Freya (Riley Voelkel).
"You're an old friend, are you?" Freya asks suspiciously.
"Well it kind of depends on your definition," Stefan responds.
Stefan's presence worries Freya because the prophecy that spells the death of the original vampire family says a friend will fell one of them.
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Elsewhere in Friday's episode, the Strix makes another move against the Mikaelson family, which forces Freya to team up with Marcel (Charles Michael Davis) and Hayley (Phoebe Tonkin). Meanwhile, Davina (Danielle Campbell, who's been making headlines off screen with boyfriend Louis Tomlinson) continues searching for a way to be reunited with her love, Kol.
The Originals airs Friday (9 p.m. ET) on The CW.