|“||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
- Elisha Henig as Holden
- This is the first and only Halloween-themed episode of the entire series.
- This episode was originally scheduled to air on October 15, 2016 but was replaced with I Put a Spell on You.
- Mr. Finn's costume is Jack Black; Jack Black portrayed Mr. Finn in the School of Rock movie.
- The title of the episode could be a reference to the album Welcome to My Nightmare by Alice Cooper.
- This is the fourth most viewed episode of Season 2.
- Elisha Henig (known for guest starring on multiple Nickelodeon shows) guest starred in ths episode as Holden.