• “If you say one word....” — Derek to Stiles in Wolf's Bane.
  • “You want me to teach you, get rid of her.” — Derek to Scott in Heart Monitor.
  • “You wanna do homework or do you wanna not die?” — Derek to Scott in The Tell.
  • “She's a psychotic bitch helping you kill people.” — Derek to Peter Hale in Wolf's Bane.
  • “You gotta be kidding me...” — Derek’s reaction to Scott’s howling in Heart Monitor.
  • “I’m gonna kill both of you! What the hell was that?! What are you trying to do, attract the entire state to the school?!” — Derek to Scott and Stiles in Heart Monitor.
  • “How about this? Either you cut off my arm, or I’m gonna cut off your head.” — Derek to Stiles in Magic Bullet.
  • “I’m the Alpha now!” — To Scott in Code Breaker.
  • “Start the car, or I’m gonna rip your throat out, with my teeth.” — Derek to Stiles in Magic Bullet.