While the main foursome of Pretty Little Liars has remained constant throughout the show's run (with the addition of Mona and Alison as needed), minor characters come and go like patrons of the Brew. One day they're in the A team, the next they're shipped out of Rosewood. While some people have disappeared for good reason — Emily's ex-girlfriend Paige moved to California; Alison's mom got murdered — others fade away with zero explanation. Whither that cute boy from the country club that Spencer liked in season one? What happened to Aria's childhood friend Holden? And where the hell is Jenna? (Please note: Parents of the Liars have been excluded from this list because unless they have been confirmed dead you can assume they are absent any given week due to "a conference in Albany.")

1. Alex Santiago, last seen season one, episode 12. Spencer took a walk on the wrong side of the tracks with this hot tennis player who worked at the country club. She encourages him to apply to a tennis camp in Sweden even though he's not interested. After A sends his in application for him, Alex leaves Spencer at a party thinking she did it. But she didn't, Alex! Did you go to Sweden anyway? With what money? Inquiring Spalex (?) shippers need to know.

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2. Danielle, last seen season two, episode three. Danielle dated Lucas for one episode in season two then was never heard from again. Is the Rosewood PD sure she's not in the bunker?

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3. Holden Strauss, last seen season three, episode six. Childhood friend of Aria's whose interests include doing martial arts in spite of his heart problem. He "dated" Aria in season two when she was still keeping her relationship with Ezra a secret, but after an episode where Holden helps Emily figure out where Maya was last seen alive, he is never heard from again. Perhaps doing tang soo do with a bad heart finally killed him.

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4. Jake, last seen season four, episode 16. One of those mysterious Pretty Little Liars characters that has no last name despite being relatively important to the plot, Jake was the gorgeous martial arts instructor who Aria dated for a minute after trying to learn self-defense. They broke up because he couldn't stay awake during old movies, but what happened after he got stabbed in the foot by his own punching bag? A simple "he bled to death" in the next episode would have sufficed.

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5. Jesse Lindall, last seen season four, episode 18. Rosewood High School guidance counselor who appeared in two episodes then vanished. What gives, Mr. Lindall? These children are clearly in need of some guidance.

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6. Noel Kahn, last seen season five, episode nine. Noel's involvement in everything has always confused me so much that I'm convinced he's a ghost only the Liars can see. The last time we saw him, he had stolen an envelope full of pictures of Ali for reasons that have never been explained. Spencer hit him with a fireplace tool at the lake house, then he walked out into the dark Pennsylvania night, presumably to join up with his ghost friends for a ghost party.

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7. Sydney Driscoll, last seen season five, episode 13. Jenna's human guide dog, last seen at the Ice Ball. Like Jenna, she seems to hate Ali, but not enough to have done anything about it in many episodes. Swim team must take up a lot of her time.

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8. Lucas Gottesman, last seen season five, episode 13. Lucas and the next character on this list have always popped in and out as needed, but at this point, don't you want to know where they go during those episodes-long stretches where no one hears from them? He needs to return and help Caleb do some hacking soon, or I will assume he too is dead.

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9. Jenna Marshall, last seen season five, episode 13. Ali and company are the reason Jenna is blind (or not blind — who can keep track?), so you can understand why she'd want to keep her distance. As of the Christmas episode, she was hellbent on taking Ali down but has since floated away into the ether. Come back and take her down, Jenna! Just because she helped rescue her friends from a psychopath's missile silo doesn't mean she's not still a bitch.

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10. Mrs. Grunwald, last seen season five, episode 14. Mrs. Grunwald doesn't live in Rosewood, but given that she's some sort of witch who (1) knew that Mona wasn't dead and (2) pulled Alison out of the ground way back when, you'd think the Liars would contact her to see if she can help with this Charles business. But no. They prefer to continue hiding things from the police, because that's always worked out so well for them.

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11. Gabriel Holbrook, last seen season five, episode 18. After helping Alison, Holbrook was suspended from Rosewood's finest/shadiest for "inappropriate behavior." He was so upset about this that he grabbed Hanna hard enough to make her hit him with a tire iron, and then — you know how this goes. Revenge is a dish best served ambivalent.

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12. Cyrus Petrillo, last seen season five, episode 21. As of season five, Cyrus was in the hospital with burns courtesy of A. Someone, maybe A, hid in the burn unit and moved toward him like they meant to cause him harm, then nothing. Logic says that person killed him, but logic has never applied in Rosewood. Don't be surprised if he returns in five episodes with a new face.

ABC Family

13. Mike Montgomery, last seen season five, episode 24. Like Lucas and Jenna, Mike has always been in and out, but where has he been ever since his sister got locked in a missile silo for three weeks? Surely that trumps lacrosse practice. Is he Charles?! (No. Probably not. Maybe? I have no idea.)

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Eliza Thompson senior entertainment editor I’m the senior entertainment editor at Cosmopolitan.com, which means my DVR is always 98 percent full.

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