On March 22, the casts and producers of the CW drama "The Vampire Diaries" and its spinoff "The Originals" hosted back-to-back PaleyFest panels at the Dolby Theatre in Hollywood to talk about their craft for killing, kiss scenes and conniving plans -- the second of which being by far the most interesting to fans, who treated the event like a modern-day Beatles concert. Amidst the screams from the audience, those on stage gave some helpful insight into both shows:

"The Originals" was going to be set in Chicago instead of New Orleans.

Julie Plec, who exec produces both shows, said the original "Originals" plan was to go back to Chicago, where there had already been some story with Claire Holt's original vampire sister Rebekah from her time on "Vampire Diaries," but that idea was scrapped when they realized they wanted to film in Atlanta and the two cities don't look alike.

Instead, co-exec producer Michael Narducci said the idea for a New Orleans-set spinoff flowed freely when they visited the Crescent City and made use of its liberal open container laws.

Joseph Morgan and Daniel Gillies, who play original vampire brothers (well, Morgan's character is a vampire-werewolf hybrid) were pushing for an "Originals" spinoff.

They would send Plec pictures of what they thought the show would be like.

"We sort of had these fantasies about that and it seemed to materialize much quicker than I would imagine," said Gillies.

The actors know that their characters may come to fatal ends, but they (usually) get fair warning.

"We have a rule that if you're killing off a series regular, you have to tell them first," said Plec. "If you're killing off a person temporarily, you have to warn them before the script comes out."

Unfortunately, no one warned Danielle Campbell that her character Davina would temporarily die on "The Originals." She found out when the script came out. Plec sent her an apologetic email.

That said, Plec said on the "Vampire Diaries" panel that new characters on that show don't have much of a shelf life.

And "Vampire Diaries" Somerhalder, who played a character on "Lost" that suffered this fate, commiserated with these actors.

Even villains need backstories.