: During a Halloween train ride, a mysterious, cold little girl visits Hanna's mother, Ashley, at home. This girl is heavily implied to be a spirit, likely referencing the twin story Alison told in earlier seasons. Celebrity Ghost Stories (Season 3, Episode 13)
: Penelope meets her ex-boyfriend Max at a wedding and realizes she is truly happy being single. Meanwhile, Elena confronts her father about their relationship. The episode concludes with Penelope officially becoming a certified nurse practitioner. [S3E13] Ghosts
The story for varies significantly depending on which TV series you are referring to, as several shows have an episode with this exact designation or title. Supernatural (Season 3, Episode 13: " Ghostfacers ") : During a Halloween train ride, a mysterious,
The series finale for the Netflix run of this sitcom used the title "Ghosts" metaphorically. Supernatural (Season 3, Episode 13: " Ghostfacers ")
: Sam and Dean Winchester accidentally end up in the middle of a reality show investigation of the "haunted" Morton House.
who was the little girl who came into hanna’s house? (s3 ep 13)
This is the most well-known "S3E13" involving ghosts. It is a meta-episodic parody presented as a pilot for a reality TV show called Ghostfacers .