|“||I felt those memories...is this the part where I get locked up?||”|
—Principal Mullins to Dewey
When Principal Mullins goes home sick, Mr. Finn's class decides to celebrate Halloween in school.
- Breanna Yde as Tomika
- Ricardo Hurtado as Freddy Heurta
- Jade Pettyjohn as Summer Hathaway
- Lance Lim as Zack Kwan
- Aidan Miner as Lawrence Dooley
- Tony Cavalero as Dewey Finn
- Jama Williamson as Principal Mullins
- Ivan Mallon as Clark O'Shannon
- Haley Powell as Esmeralda
- David Pressman as Vice Prinicipal Sternhagen
- Sydney Mikaila as Olive
- Elisha Henig as Holden
- This is the only Halloween episode of the show (so far).
- Mr. Finn's costume is Jack Black. Jack Black had a main role in the School of Rock movie.
- The title of the episode could be a reference to the album Welcome to My Nightmare from Alice Cooper.