Pretty Little Liars should brace themselves for another Rosewood newbie as an old familiar face reappears.

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Mona's death opened up a can of worms for Alison and the Liars, and Lesley will be the next problem to come slithering out. And riding in on her coattails will be Holbrook.

"In the episode where Mona met her demise, she was talking to her friend Lesley on the phone that day and we finally get to meet Lesley," series creator Marlene King teased, according to E! Online. "She comes to town."

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The new character will make her first appearance in episode 18, "Oh, What Hard Luck Stories They All Hand Me." Unfortunately for the Liars, their history with 'A' has taught them to cast a wary eye on any newcomers. In a preemptive strike, the teens will send Hanna in to get the dirt on her past.

While Hanna is preoccupied, her cohorts will have to deal with Holbrook's return.

"He certainly appears to be a force operating in the shadows over the next couple episodes, and then he makes a substantial and dramatic [physical] return about halfway through the season," executive producer Joseph Dougherty told The Hollywood Reporter.

Will both Lesley and Holbrook have ties to 'A', or can Hanna and Co. turn their focus to other suspects?

Find out more when Pretty Little Liars airs Tuesdays at 8 p.m. ET on ABC Family. Click the video below to see a preview for the series' next episode.