Stargate: Atlantis2004

Carson Beckett M. D.:
We still have no idea how it works, but during the Wraith feeding process, the victim is injected with a special enzyme. It strengthens the human body temporarily and ensures that the heart continues to beat.

Maj. John Sheppard:
Why would they wanna make you stronger?

Carson Beckett M. D.:
So the victim doesn't die immediately. The feeding process is so traumatic, without the special enzyme, we shut down far sooner than they like.

Elizabeth Weir, Ph. D.:
They make you stronger so they can take more time to kill you.

Carson Beckett M. D.:
Lovely, isn't it?