One of the most shocking spoilers revealed in the Season 4 trailer of “The Originals” was the return of Cami O’Connell (Leah Pipes). Klaus’ (Joseph Morgan) lover died tragically in Season 3, so what is she doing back in his life now?

Of course, judging from the promo, it is clear that she is a figment of Klaus’ imagination. She is a mere hallucination. But why is she back? After all, when the Mikaelson family returns to The CW next week, it would have been five years since Marcel (Charles Michael Davis) stabbed Klaus with Papa Tunde’s knife.

“It’s pretty clear that Cami was someone who had a massive impact on the entire show and our entire cast of characters but in particular, Klaus,” “The Originals” showrunner Michael Narducci told Entertainment Weekly, “I am positive that the words that she shared with him before she died were echoing in his mind as he went through that trial, as he was stabbed by Marcel, and while he has been tormented and incarcerated for the past five years.”

Five years of torture at the hands of Marcel would drive any one insane, let alone Klaus. The first episode of Season 4 will give fans a sense of how the werewolf-vampire hybrid endured the ordeal psychologically and Cami plays an important role in understanding how he got through it.

“It gets into the question of once someone comes into your life and influences you in that kind of way, are they ever really separate from you or are they always a part of you?” Narducci said. “I think the show definitely answers that question.”

Episode 1 kicks off with Marcel welcoming un-sired vampires to New Orleans but he soon finds out that they pose a threat to his rule. Meanwhile, Hayley (Phoebe Tonkin) is close to finding a cure and waking up Elijah (Daniel Gillies).

“The Originals” Season 4 premieres Friday, March 17 at 8 p.m. EST on The CW.