After going AWOL for aaaaaages, we were finally reunited with Lucas Gottesman at the start of season five.
And, once more, it seemed like he was on Mona's team.
Mona was recruiting an army of all the kids that Alison used to bully before her disappearance.
She needed to watch her back!
Paige even admitted that she was happy when Alison was gone.
And she won't have been the only one.
As news of Alison's "kidnapping" spread, Lucas started to feel sorry for her.
Until Mona set the record straight.
Lucas and Hanna were reunited and we were loving it!
When Alison returned to school, Mona and Lucas started making plans.
They weren't going to be pushed around by Alison ever again!
Hanna was supposed to meet Lucas' new girlfriend but ended up pretty tipsy instead!
Lucas, and the rest of Mona's army, did a great job of turning the Liars against Alison.
Alison was being stripped of her Queen Bee title a little more each day.
Until Alison started to win people over again.
Lucas had to break the news to Mona and it didn't go so well!
Lucas managed to access Alison's lie detector answers.
Using his best sweet and innocent face.
And, of course, Mona was nearby with her hacking skills.
Was there anything that she couldn't do?
Lucas looked just as shocked as everyone else when Mona was murdered.
But we always wondered just how much he really knew.
Finally, can we just take a moment to appreciate what a great Santa Lucas made?
Do you think we'll ever know which side Lucas is on? Let us know your thoughts below.
Tune in to Freeform to catch the Season 7 premiere of PLL on Tuesday, June 21 at 8pm|7c!