Supernatural (2005)

S12E14 The Raid

An opportunity to eliminate a vampire nest takes an unexpected turn when the alpha vampire arrives, shifting the balance of power. Mary and the British Men of Letters find themselves on the defensive as their plans unravel. Meanwhile, their primary goal of recruiting Sam and Dean hangs in the balance, complicating their mission further. The encounter tests their resolve and forces them to confront the true dangers lurking in the shadows.