1. When the Liars got a hold of A's broken cellphone and needed Caleb to recover its data.
Naturally Caleb wanted to know who the phone belonged to, but Spencer told him that the less he knew the better.
2. When he should have been studying at school, but was still decrypting data!
And when he asked Hanna whose phone the data was coming from, she still wouldn't spill.
3. At one point, Caleb started demanding answers!
But, alas, it was to no avail because as we all know, the Liars are pretty good at keeping quiet!
4. And the more Caleb got involved, the more questions he had.
So he kept digging.
5. Afraid for his safety, Hanna tried to stop his involvement by destroying his flash drive in a blender.
Luckily, being the tech genius that he is, Caleb kept a copy of all the data he recovered.
6. And Caleb continued his quest to... well, he still didn't actually know what they were looking for.
And poor Hanna was kept out of the loop. That is until...
7. 'A' sent this message to Hanna:
Hanna was not happy when she found out that Caleb had gone behind her back, but all was soon forgiven.
8. Let's not forget that Caleb was THE reason the Liars were able to get more and more of Ian's video footage from the night Alison disappeared.
9. And when he had to kiss Mona to try and draw out a text attack from 'A.'
Little did he know, the enemy was closer than he thought.
Caleb has SO many great moments. What's your fave?
Tell us in the comments!