Ep 18. Party on, Garth

In Supernatural season 7 episode 18, titled "Party on, Garth," the Winchester brothers, Sam and Dean, are called to investigate a series of bizarre deaths that are happening in a small town in Wisconsin. They soon discover that the victims were all clients of a health food store that sells a supplement called "Zeus Juice," which promises to boost your energy levels and overall health.

To get more information, the Winchesters send their friend and fellow hunter Garth to the town to pose as a health enthusiast and find out what's really going on. However, Garth proves to be a less-than-capable spy, and his bumbling mishaps lead to him befriending the eccentric health food store owner, Don Stark (played by DJ Qualls).

As Don throws a "Zeus Juice" party at his store, Garth invites the Winchesters to come and investigate undercover. But as they delve deeper into the mystery, they begin to realize that the strange deaths may be linked to something far more sinister than just a shady supplement.

Throughout the episode, there are plenty of laugh-out-loud moments as Garth tries to navigate his way through the investigation while also dealing with a personal issue of his own. Along the way, the Winchesters must also confront their own demons, both physical and emotional, as they continue their fight against the forces of evil.

Overall, "Party on, Garth" is a fun and entertaining episode that injects some much-needed levity into the often-grim world of Supernatural. With its witty writing, memorable characters, and exciting plot twists, it's a must-see for fans of the show.