Like someone who buys a Ferrari just to take the kids to school, the Winchester brothers have been massively under-utilizing their Bunker in . Returning from an extended pandemic break,  season 15 picks up with trying to fix their creaking home. Unable to call a regular plumber to their top-secret HQ, the boys set to work themselves, and hit "Reset" on the Bunker's control room to try and kick the electrics back into life.

Instead, they unleash a Wood Nymph who was secretly locked within the Bunker's walls, and this mysterious character, affectionately known as Mrs. Butters, teaches the boys many secrets about their home.

During the first few seasons of , the Winchester brothers lived on the road, moving from motel room to motel room in their iconic Impala chasing down monsters to kill.

In  season 8, Sam and Dean discover that they are the last living legacy members of an ancient anti-paranormal organization called the Men of Letters. As the only remaining successors, the - the Men of Letters' base of operations. Covered in warding to keep out enemies, the introduction of the Bunker changed  by adding a regular setting. The bunker is also packed with magic ingredients, ancient artifacts and helpful tomes, and made the lives of Sam and Dean Winchester infinitely more comfortable.

In 's "Last Holiday," however, Mrs. Butters reveals the true power of the Bunker. According to the enthusiastic housekeeper, the Winchesters have been using the Bunker on "standby mode" right from the start, limiting the power of its warding and removing many of the most useful features. When Dean hits the big reset button, the power of the Wood Nymph is infused with the Bunker, giving the Men of Letters' HQ a major upgrade.

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