Garth heads to Junction City, Kansas, to "garth" a ghost that has killed on teenager and he burns his bones in the cemetery. When he is ready to return, the brother of the victim is also killed in the same "modus-operandi" and Garth calls Dean and Sam to help him to get rid of the supernatural creature. Soon they realize that the ghost has been sent by a revengeful man to seek revenge against his former business partners and can only be seen by drunken people.
"Party on, Garth" is a funny episode with the clumsy, but efficient Garth Fitzgerald IV. His sentences using the verb "to garth" are very original and hilarious. My vote is seven.
Title (Brazil): "Party on, Garth"