Stratagem, ENT 3
Stone cold yes.
Archer continues to go BSG and think about just how he plans to defeat the Xindi. He capitalizes on a lucky break and puts Degra through an Inception-like rigamarole to try and get secrets from him.
After many reversals he succeeds and, best, sets him loose none the wiser for possible future benefit. That is hardcore. This is quite possibly the best Enterprise episode yet.