Ep 3. The Foundry

In episode 3 of season 12 of Supernatural, titled "The Foundry," Sam and Dean Winchester receive a mysterious video message from their deceased mother, Mary. The video shows Mary confronting a man who she believes can help her escape the alternate universe that she has been stuck in since her death. The man is revealed to be a hunter named Wally.

Sam and Dean set out to find Wally in hopes of learning how Mary survived and how they can bring her back to the real world. Along the way, they encounter a series of dangerous ghosts who haunt an abandoned building called the Men of Letters bunker.

The brothers eventually locate Wally and they team up to help Mary escape the alternate universe. However, when they arrive at the location that Mary described in her video message, they find themselves confronted by a powerful supernatural being that threatens to destroy them all.

As they fight to survive, the Winchester brothers discover the true purpose of the Men of Letters bunker and the secrets that it holds. They learn that the bunker was designed to hold and protect powerful supernatural artifacts, and that it is home to a powerful, malevolent force known as the Darkness.

"The Foundry" is a thrilling episode that delves deeper into the complex mythology of Supernatural. It is full of action, suspense, and heart-wrenching moments as the Winchester brothers attempt to rescue their beloved mother and confront the forces of evil that threaten their world. Fans of the show will not want to miss this exciting episode.