If you don't remember who Colin is, this video might help refresh your memory:
Remember now? Colin was Melissa and Wren's roommate in Season 5! We're not going to lie, we had TOTALLY forgotten about him until we rewatched this episode, but then we suddenly thought that this guy MIGHT have something to do with A.D.! Here's why:
1. He was Wren and Melissa's roommate. Or "flatmate".
We've ALWAYS been a bit suspicious of Wren and Melissa so could Colin be just as shady as them? Also, he's British. Haven't the Liars been getting mysterious phone calls from a British guy? Hmm....
2. He looks a LOT like Charlotte.
Were they related? Were they working together at this time? And could Colin now be seeking revenge for her death?
3. Spencer found a blood vial in her bag when she was in London.
There's no way that could have got past security at the airport! Did Colin put it in her bag?
4. And he was VERY interested in Spencer.
But was it purely for romantic reasons?
What do you think? Should we be suspicious of this guy?
Tell us your thoughts in the comments!