Meet New 'Vampire Diaries' Cast Members: How Long Will They Stay Alive?

Mystic Falls has been a revolving door of a hotspot for the last four and a half seasons. New characters come, they make waves, and most of the time they die (usually at the hands of one of the resident vampires).

Now, there are three new faces gracing "The Vampire Diaries," which means it's time to start the "when will they kick the bucket" pool!

Heather Hemmens ("Hellcats"), Chris Brochu ("Melissa & Joey"), and Raffi Barsoumian are set to appear in episodes this spring. Hemmens will be a love interest for Damon's partner in bloody crime, Enzo; Brochu will play a gay student who befriends Elena and Caroline at Whitmore College, and Barsoumian's Markos is a "charismatic presence with supernatural origins."

Hemmens and Brochu are both experienced actors who've racked up quite a few guest starring gigs. Hemmens starred in The CW's short-lived "Hellcats," and has appeared in "CSI: NY," "CSI: MIami," and most recently, "Grey's Anatomy."

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Brochu is best known for his role as the jerk lead singer of a popular band in Disney's original movie, "Lemonade Mouth." The actor himself is a singer who once fronted the band Fall Into Faith. He's logged time on "Hannah Montana," "The Mentalist," "Melissa & Joey," and "NCIS: LA."

Both have talented siblings: Hemmens's sister, Natalie, is a handbag designer and her brother, Jason, is a jazz musician; Brochu's brother, Doug, is also an actor who has done work on Disney series.

Barsoumian is a newcomer who honed his chops at the Oregon Shakespeare Festival.

"Vampire Diaries" fans can look forward to some juicy storylines involving all three actors. Hemmens's character, Maggie, doesn't show up until Episode 19, but we've already heard a bit about her. Enzo (Michael Malarkey) revealed that he fell in love with Dr. Whitmore's lab assistant back in 1953.

"She wasn't part of the torture and experiments. For the longest while, she didn't realize Dr. Whitmore was doing more than just observing my behavior," Enzo said of Maggie. "I didn't have the heart to tell her. I was just so glad of the company. When she finally realized what was going on here, she couldn't bear it. So she said she was sorry and she left."

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Meanwhile, Brochu's Luke is a seemingly fun, normal guy at first — but it's soon revealed that he befriends the Mystic Falls girls for a mysterious agenda that involves witches and Travelers. And we wouldn't be surprised if Barsoumian's Markos is part of that world, too.

Unfortunately, love interests and people with mysterious agendas don't tend to last long in the "Vampire Diaries" universe. Remember Jesse and Aaron, introduced at the beginning of this season? Rest in peace, guys.

So, will Maggie, Luke, and Markos turn out to be just another set of "red shirts," easily disposable characters? It doesn't look good for them, that's for sure. Rarely do guest stars last longer than a few episodes or a season on "The Vampire Diaries." They only stick around if they're supremely popular — like Joseph Morgan and Daniel Gillies, whose Klaus and Elijah were so beloved that they got their own spinoff show!

All the original characters have managed to elude death for nearly five seasons — even regular humans like Jeremy and Matt — or at least, if they died, they came back to life. Guest stars? Might want to have an obituary ready!

"The Vampire Diaries" airs Thursdays at 8 p.m. on The CW.