Ep 18. The Memory Remains

In Supernatural season 12 episode 18, titled "The Memory Remains," Sam and Dean investigate a case in a small town where people have been disappearing every 20 years. Upon arriving in town, they discover a local legend about a goat-headed monster named the Black Bill who demands a sacrifice every 20 years. The brothers suspect that the creature may be a pagan god and begin to investigate the local lore.

As they dig deeper into the town's history, they discover that the legend of the Black Bill may not be just a myth. They meet a man named Marcus who claims to have witnessed the creature firsthand and agrees to help them in their investigation. As they explore the town, they encounter several suspicious characters and uncover a decades-long conspiracy to keep the truth about the Black Bill hidden.

Sam and Dean find themselves in the middle of a dangerous situation as they try to expose the truth about the creature and save innocent lives. They must navigate through the town's dark past and unravel a web of lies and secrets. With the clock ticking down to the next sacrifice, the brothers must race against time to stop the Black Bill before it's too late.

Throughout the episode, there are also flashbacks to the 1960s, where the viewers get to see the events that led up to the first Black Bill sacrifice. These flashbacks reveal important details about the creature and provide insight into the motives of the town's inhabitants.

"The Memory Remains" is a thrilling episode of Supernatural that will keep viewers on the edge of their seats. With an intriguing plot, suspenseful twists, and a monster that is one of the show's most memorable and chilling creatures, this episode is a standout in the series.