Whether or not he's Uber "A", at this point, it's clear that Ezra (Ian Harding) is up to something sketchy. And after Pretty Little Liars Season 4, Episode 18 (“Hot for Teacher”) it seems equally clear that Ezra has an accomplice who was helping him by taking pics of the girls.

So, who's helping Ezra? The obvious answer would be Mona they did have that mysterious meeting, and she has a proven history of spy skills but in Rosewood, the obvious is rarely right.

Every week, we like to delve into the world of fan theories and see what interesting ideas pop up, and these week we want to look at one of the more extreme, but still plausible, theories about who Ezra is working with: Jason DiLaurentis.

Why might Ali's brother be teamed up with Ezra? Here are some of the clues and theories that make us say Hmmm, that's possible.

He's been MIA. One reason Jason is suspect right now is that he's been MIA all season. His mom claims he's down south working on his grandmother's old house, but that could easily be a lie.

He has a history with photographs. Jason was a member of the NAT club, which was all about creepy spying, so he has the skills needed to help Ezra out. Plus, more recently, there was that time he had a bunch of photos of Aria, which some have tied to the photos of Aria sleeping that were in "A"'s lair in the tag for Episode 18.

Could Ezra be helping Ali? The biggest problem with this theory is that it really seems like Jason is genuinely upset over his sister's apparent death. While that could all be an act, we have a hard time imagining him helping someone who was out to hurt Ali. But, as we've explored in the past, some fans think Ezra may actually helping Ali. Or, if he's not teamed up with her, he might be trying to find her/find out what happened to her because he cares about her, not because he wants to hurt her. In either case, we could easily see him recruiting Jason to his cause.

What do you think of this theory — is it possible, or totally crazy? Sound off in the comments below.

Catch the next episode of Pretty Little Liars Season 4 on Tuesday, February 11, 2014 at 8 p.m. ET on ABC Family.

Rebecca Martin is an Associate Editor at Wetpaint Entertainment and our resident Game of Thrones, Breaking Bad, and genre TV expert. Follow her on Twitter and Google+!