Supernatural - My Bloody Valentine, S05E14

These episodes are the best - the ones where the start and set up seems to be some bizarre and random episode designed to amuse, but turn into those where the mythology and the main plot are really the most important aspect.

It started with gruesome deaths. Really gruesome deaths. A couple ate each other to death. Then, another couple went crazy and Romeo + Julietted out of this world. Both couples were imprinted by marks of a cupid, leading Castiel (Misha Collins) to believe that said Cupid had gone rogue.

Calling upon the Cupid, Dean (Jensen Ackles), Sam (Jared Padalecki), and Cas confronted him on the fate of his latest chosen lovers. When the Cupid appeared, he was absolutely naked and proceeded to hug the three men. "What's going on?" Dean demanded, "Are we in a fight?" "This is their handshake," replied Castiel. "I don't like it." "No one likes it."

The Cupid, however, was not the problem. He was deeply upset to discover that his lovers had gone insane.

It did not take long for Castiel to figure out that there was a horseman about - Famine. All I can say is, thank God Cas is helping out our boys or they would not be doing too well at all. Castiel's vessel began craving beef, Sam began craving Demon blood, and Dean, strangely, craved nothing. He did not even want to go to the bar on Valentine's Day, which he usually referred to as Christmas for unattached drifters.

I cannot express the horror I felt when Sam was released for his self-imposed confinement by demons, upon whose blood he then feasted. Memories of last season and thoughts of how easily Lucifer might be able to pray on him in such a state screamed forth, projecting a situation in which I could see Sam say yes. And yet, when he waltzed into the dinner to save Cas and Dean, he was so calm. Clearly, having consumed the blood, he was as unaffected by Famine as the demons who were his aids were. Sam, using his demon powers, defeated the demons and Famine, feeling no more desire to drink their blood.

Naturally, he had to spend the next while in confinement, getting himself clean. But there was a moment of such calm there that gave me hope. Though Sam had slipped, he was still strong. The devil will not win that easily.

Do you think the demon blood will be the key to Sam's potential undoing? Or was its original ability to bring him to harm because of Ruby's manipulations?