- Sheriff Stilinski: I want you to be honest with me. Totally and completely honest. Have you been time traveling?
- Stiles: Hang on, what?
- Sheriff Stilinski: Because if time traveling is real, I'm done, I'm out. You're going to be driving me to Eichen House.
- Scott McCall: We found him like that.
- Sheriff Stilinski: Where? Swimming in the fountain of youth?
- Stiles: No. We found him buried in a tomb of wolfsbane in an Azetec temple in Mexico underneath a church in the middle of a town that was destroyed by an earthquake.
- Stiles: We'll figure this out in a day or two, he goes back to being old Derek, everyone's happy. Except for Derek, who's never happy.
- Dr. Alan Deaton: [Looking at de-aged Derek] Wow.
- Stiles: Wow? Wow as in, "I've seen this before and I know exactly what to do," kind of wow? 'Cause that's the kind of wow we were hoping for.
- Dr. Alan Deaton: I think you might be overestimating my abilities.
- Scott McCall: This is Malia.
- Peter Hale: Beautiful eyes. Did you get them from your father?
- Malia: Mother.
- Peter Hale: Interesting. Anyway, I'm sure they told you a lot about me.
- Malia: The homicidal killing spree came up.
- Peter Hale: Well, we're all works in progress.
- Malia: Well, when you progress to your next killing spree, why don't you try and make sure they all stay dead?
- Scott McCall: What do you know about people being turned by a scratch?
- Peter Hale: Did you scratch someone, Scott? Don't worry about it, the claws have to go pretty deep.
- Scott McCall: But it's possible. Like if you clawed out someone's throat?
- Peter Hale: Well, yeah, it's possible. It's also beyond rare. We're talking one in a...
- [Realization hits]
- Peter Hale: ... million.
- Rafael McCall: So, uh, Miguel. What did you say your last name was again?
- Stiles: Oh, it's Juarez. Cinqua... Tiago.
- Rafael McCall: That's a mouthful. How do you spell that?
- Stiles: Phonetically.
- Peter Hale: Quite the elaborate scheme you have here, Kate. Two countries, Aztec temples, Derek returned to a teenager. One that trusted you. One that loved you. All this complication just to gain access to our vault. Just to get your hands on that little piece of junk. Turn it over. Go ahead. There's a scrape on the back where it used to say "Made in China."
- Kate Argent: You're lying!
- Peter Hale: I admit I have a tendency to exaggerate things. But in this case the truth is so much more fun. Oh, I'm sorry, sweetheart, that little pendant is just a physical object to focus on. It's training wheels. Talia used it to teach Laura. I tried to use it to teach Derek.
- Peter Hale: I'm sure they've told you a lot about me.
- Malia: The homicidal killing spree came up.
- Peter Hale: Well, we're all works in progress.
- Malia: Well, when you progress to your next killing spree, why don't you try and make sure they all stay dead?
- Young Derek Hale: Kate?
- Kate Argent: Hey, handsome. Been a long time.
- [laugh]
- Kate Argent: Longer than you think.
- Lydia Martin: [At the site of a murder] To be honest, I have a 4.0 in AP Biology and there are parts of the human anatomy I have never seen before on these walls.