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Needed: Synopsis is incomplete.
A robot made to look like a Nazi World War II soldier attacks Cassidy Williams at her radio station, eventually self-destructing as Cassidy fights back, taking the entire building with it in the explosion. She explains to the gang that these robots have been attacking her time and again for the past week. The gang fends off more robot attacks as they continue investigate. When the gang realizes that the robots are coming from deep underwater, Daphne recruits two of her babysitting charges, Tom and Tub, and their seal (also named Scooby), to transport the gang in their submarine to the robots' spawning vats, in an area the kids tell them is called "The Midnight Zone". Shortly after submerging, the sub is attacked by a group of robots and damaged, and the gang stumble upon an underwater base and attempt to use it to repair the sub, only to discover that the base is the factory where the robots are constructed, run by Professor Pericles. In the end, Pericles escapes, leaving the laboratory to self-destruct, seemingly killing Cassidy Williams as she gives enough time for the gang, Tom and Tub, and Scooby the Seal to escape.
- Cassidy Williams (presumed death)
- Sheriff Bronson Stone
- Mayor Janet Nettles
- Tom (single appearance)
- Tub (single appearance)
- Scooby (single appearance)(no lines)
- Kriegstaffebots (first appearance)(robot)
- Ghost of Abigail Gluck (single appearance)(projection)
- Professor Pericles
- Abigail Gluck (corpse)(living in flashback)
- Mr. E (mentioned)
- Dr. Paul Williams (only time mentioned)
- Captain Michael Murphy (only time mentioned)
- Crystal Cove
- Bavaria (flashback only)
|Professor Pericles controlling the Kriegstaffebots||To kill Cassidy Williams and get the last piece of the Planispheric Disk.|
- A romance between Cassidy and Mr. E was referred to in The Night the Clown Cried II - Tears of Doom!; it was revealed the teenage Cassidy had a crush on him in Escape from Mystery Manor.
- This episode was aired in Latin America on November 10, 2012.
- Professor Pericles says that he met Abigail Gluck in the 1930's—this would mean that he's at least 85 years old. While this may seem improbable, there are some types of parrots that can live well into their 90s, and up to the age of 100.
- Cassidy Williams is the first member of the original Mystery Incorporated to seemingly be killed. The remaining members eventually die by the Evil Entity in the final episode, Come Undone.
- This episode was included in Cartoon Network's Scooby-Doo! Back to School Marathon (August 10-11, 2013).
- The title 'The Midnight Zone' parodies the TV show The Twilight Zone.
- Tom, Tub, and Scooby the seal, are from Hanna-Barbera's Moby Dick and Mighty Mightor, except in that TV series, Moby Dick was a real whale.
- Tom and Tub's fathers are Dr. Paul Williams and Captain Michael Murphy from Sealab 2020, another Hanna-Barbara show.
- Velma compares Williams and Murphy to Simon & Garfunkel.
- Turning around a chair in which a villain sits, only to find a corpse, echoes the movie Psycho.
Animation mistakes and/or technical glitches
- When Velma picks up the Benevolent Lodge of Mystery photo, her swim suit sleeves are colored like Daphne's.
- Then again, it could have been Daphne who picked up the photo.
- A second later, Fred's arm is hidden behind Velma's head. His hand looks like the sleeve does not reach it.
Inconsistencies/continuity errors and/or goofs/oddities
- Gluck was searching for two pieces, but in Theater of Doom, it was revealed that only one of the pieces fell to the bottom of the ocean, while Friar Gabriello Serra put one in a wheel of cheese. However, it's possible Gluck never knew that.
In other languages
|Brazilian Portuguese||A Área da Meia-Noite||The Midnight Area|
|French||La Cité engloutie|| The Engulfed City|
The Swallowed City
|Greek||Η Ζώνη του Μεσονυκτίου||The Midnight Zone|
|Hungarian||Az éjfekete zóna||The Midnight Zone|
|Italian||La Città Sommersa||The Submerged City|
|Polish||Strefa północy|| The Midnight Zone|
The North Zone
|Spanish (Latin America)||Dimensión Desconocida||Unknow Dimension|
- Scooby-Doo! Mystery Incorporated: Season Two, Part 1 - Danger in the Deep DVD set released by Warner Home Video on November 13, 2012.
- Scooby-Doo! Mystery Incorporated: The Complete Season 2 DVD set released by Warner Home Video on October 7, 2014.
- Scooby-Doo! Mystères associés: L'intégrale de la saison 2 (Scooby-Doo! Mystery Incorporated: The entirety of season 2) DVD set released by Warner Home Video on September 10, 2013.
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