Characters Who AppearEdit
- Kenny Tennyson
- Lisa Simpson(Debut)
- Jiminy Cricket(debut)
- Homer Simpson(debut)
- Julie Yamamoto(minor appearence)
- Tricia(minor appearence; neutral character)
- Mordecai and Rigby
- Madame Raya(Debut)
- La Llorna(debut; main antagonist; only appearence)
- Lock, Shock and Barrel(Minor antagonists)
On Halloween, the MCF encounter the case of La Llorna, an old folktale, but when the witch steals Pinocchio, Kenny and Lisa, they must save them before she drowns them.
- Jessy-The Wilted Lover(13 Ghosts)
- Daisy-Vanellope Von Shweetz(Wreck-it-Ralph)
- Emmy-Lydia Deetz(Beetlejuice; movie version)
- Starz-Anna Various(Van Helsing)
- Tracy-Sally Finklestein(The Nightmare Before Christmas)
- Mordecai-Davy Jones(Pirates of the Carribeans)
- Rigby-Jason(Friday the 13th)
- La Llorna means "The Cryer" or the "Weeping Woman". In the Grimm episode, she planned her sacrifice, but Nick stopped her in time.
- Except for the Theme song, this is the only mystery so far to have no songs as the authoress wants to keep this serious as ever.
- This case references "MCF: A Musical Nightmare" and Mystery case Files: The Fanfiction episode "A Flea in Time"