Stargate: Atlantis (TV Series)

Instinct (2005)

Torri Higginson: Dr. Elizabeth Weir

Quotes 

• Dr. Carson Beckett : Right now, our best guess is that the Wraith evolved from the iratus bug.

  Lt. Colonel John Sheppard : Like the one that attached itself to my neck a year ago?

  Dr. Carson Beckett : That's right.

  Lt. Colonel John Sheppard : I hate those bugs.

  Dr. Carson Beckett : Trust me, I know. We've speculated that they evolved into the Wraith when they began to take on the characteristics of the humans they were feeding on. Now, there are many aspects of human physiology that are quite useful-bipedal motion, opposable thumbs, large brain capacity. But the human digestive system serves no purpose in the adult Wraith. So, why have one at all?

  Dr. Elizabeth Weir : Because they eat normal food when they're young.

  Dr. Carson Beckett : Exactly then at some point, they lose the ability to sustain themselves with that food.

  Lt. Colonel John Sheppard : So it's a teenage thing. Pimples, rebellion, life sucking.