- SpongeBob SquarePants
- Gary the Snail
- Chair monster (debut)
- Branch monster (debut)
- Squidward Tentacles
- Eugene H. Krabs
- Face in the darkness (debut)
- Gale Rechid
- Shelley (cameo)
- Patrick Star
- Pinky (name appears on sign)
- Barnacle Boy
- Mermaid Man
- The Moth (debut)
- King Neptune (mentioned)
SpongeBob reads a scary book before bedtime. Because of this, he sees scary creatures when he turns off the light, such as the chair being a monstrous brain beast and a coral branch tapping the window as a monster's hand.
When at the Krusty Krab, he gets terrified of a pot on his head, then tells Mr. Krabs that if he blinks, he sees something scary. He then tries not to blink, but it does not work. He then gets spooked by the dark in the freezer when Mr. Krabs wanted him to get some fresh Krabby Patties. Mr. Krabs tells SpongeBob to get night lights so he will not be scared of the dark. He first buys one and however, buys more when he finds darkness in his house because he is easy to fool. Eventually, there are thousands of night lights in every room that he does not need.
Patrick wakes up and sees SpongeBob's house lit up. He thinks SpongeBob is throwing a party and goes to his house, but SpongeBob warns him about the dark so he brings his rock inside SpongeBob's pineapple. While getting more night lights, Squidward tells them that they have too many lights and that the creepy creatures of the dark are just their imagination. While SpongeBob and Patrick get a lighthouse, it makes a giant "M" in the sky so Mermaid Man and Barnacle Boy come. Meanwhile, the Moth, one of Mermaid Man's enemies who he has been searching 57 years for, finds the light, but SpongeBob traps him inside the lighthouse. The Moth then carries the lighthouse along with the pineapple.
SpongeBob and Patrick are alone in the dark until the sun rises. Patrick goes up to get it, thinking it is a light and SpongeBob falls asleep. Patrick comes down again on fire shouting "Too much light!"
|( ‣ ) Associated production music|
|( • ) Original music|
|( ◦ ) SpongeBob music|
‣ Stealth by Night - Jack Coles [SpongeBob reading a scary story]
‣ Tales from the Swamp (c) - Ron Goodwin [SpongeBob sees a monster]
‣ Vibe Q Sting - Nicolas Carr ["Oh, it's just a chair."]
‣ Terror by Night - Hubert Clifford ["Whoa! Another monster!"/SpongeBob turning his lamp on and off]
‣ When Daylight Shines/Captain Lenoe's - The Folk Players [Krusty Krab exterior]
‣ Steel Licks (d) - Jeremy Wakefield [SpongeBob enters, tired]
‣ Tales from the Swamp (a) - Ron Goodwin [SpongeBob with a pot over his head]
‣ Terror by Night - Hubert Clifford [SpongeBob screaming whenever he blinks]
‣ Harp Ding - Nicolas Carr ["Brilliant idea, Mr. Krabs!"]
‣ Steel Licks (a) - Jeremy Wakefield [SpongeBob's eyelids propped open]
‣ Finger of Fear - Fredric Bayco [scary face in the freezer]
‣ Steel Licks (b) - Jeremy Wakefield [Krabs pulls SpongeBob off the ceiling]
‣ Keel Row - Brian Peters [Krabs tells SpongeBob to get a night light]
‣ Shoppers World - Harry Bluestone [SpongeBob shopping]
‣ Abject Terror - Paul Lewis [SpongeBob screams]
‣ Shoppers World - Harry Bluestone [SpongeBob goes back to the mart]
‣ Abject Terror - Paul Lewis [SpongeBob screams 2nd time]
‣ Shoppers World - Harry Bluestone [SpongeBob goes back to the mart again]
‣ Abject Terror - Paul Lewis [SpongeBob screams 3rd time]
‣ Shoppers World - Harry Bluestone [SpongeBob goes to the mart repeatedly]
‣ Tomfoolery - David Snell [SpongeBob putting night lights everywhere]
‣ Voodoo Victim - Gilbert Vinter ["I've got darkness inside of me!"]
‣ Steel Sting (a) - Jeremy Wakefield [Patrick wakes up]
‣ Goofy Conversation - Nicolas Carr, Barry Anthony ["SpongeBob's having a party without me?"]
‣ Murder in Mind [#46] - Ronald Hanmer ["That was close, Patrick."]
‣ Murder in Mind [#47] - Ronald Hanmer [Patrick pushes his rock into SpongeBob's house]
‣ Star Parade - Tony Kinsey ["Sleepover!"]
‣ Brass Flourish (a) - Barrie Hingley ["Your sleeping bag, sir."]
‣ Tripping Upstairs - Brian Peters [SpongeBob and Patrick hopping]
‣ Lap Steel - Nicolas Carr [gaping hole]
‣ Six Powerful Cues (d) - Wilfred William Burns ["THE DARK!"]
‣ Graveyard - Johnny Pearson [Squidward asleep]
‣ Drama Link (d) - Hubert Clifford [Squidward's eyes burned]
‣ Tension Bits - Nicolas Carr, Sage Guyton, Jeremy Wakefield [SpongeBob, Patrick whimpering]
‣ Dramatic Cue (h) - Chris .J. Aviles ["I can feel it, Pat."]
‣ Comic Walk - Sidney Torch ["It's me, Squidward, you idiots."]
‣ Fates [#62.02] - Gregor F. Narholz ["No, Squidward! Don't go out in the dark!"]
‣ Sponge Monger - Sage Guyton, Jeremy Wakefield ["Quick, SpongeBob, turn it on."]
‣ Potato Chips - Wade Denning [Pinky's Dance Studio sign]
‣ Sponge Monger - Sage Guyton, Jeremy Wakefield [more lights]
‣ Mermaid Man Sting - Nicolas Carr [M signal]
‣ Happy and Gay [#67.02] - Harry Bluestone, Emil Cadkin [Mermaid Man and Barnacle Boy watching TV]
‣ Life on the Wild Side - Sam Spence [Mermaid Man sees the signal]
‣ Sponge Monger - Sage Guyton, Jeremy Wakefield ["More lights, SpongeBob, more lights!"]
‣ Nude Sting - Nicolas Carr ["Mermaid Man!"]
‣ Mermaid Man Sting - Nicolas Carr [signal]
‣ Seaweed - Steve Belfer [SpongeBob explains]
‣ Brave and Bold - Chris Payne, Paul Rogers [moth appears]
‣ Six Powerful Cues (a) - Wilfred William Burns ["Dear Neptune!"]
‣ Caped Crusader - David Farnon ["Come get some... fiend!"]
‣ Ramblin' Man from Gramblin' - Sam Spence [Absorbo-Pants]
‣ The Beast Within - Paddy Kingsland ["Savory light, come to me."]
‣ Ramblin' Man from Gramblin' - Sam Spence [moth trapped]
‣ Cellar Search - Philippe Pares [moth flies away with SpongeBob's house]
‣ Alekoki - Kapono Beamer [Mermaid Man and Barnacle Boy leave]
‣ Hawaiian Cocktail - Richard Myhill ["We're all alone, Patrick."]
‣ Parting of the Clouds - Nicolas Carr [sunrise]
‣ Old Hilo March - Kapono Beamer [ending]
- This episode is available on Friend or Foe?, Season 5 Volume 1, Complete Fifth Season, and First 100 Episodes DVDs.
- Although this episode premiered in 2007, it was made in 2006 according to the credits.
- This episode was available on the Friend or Foe? DVD, released earlier in 2007, before it aired on television.
- The beginning of this episode is similar to that of "Krab Borg."
- SpongeBob develops a fear of something after seeing something scary and keeps overreacting in both episodes.
- The novel SpongeBob reads breaks its fourth wall, talking about the author dying before finishing the story.
- The face in the freezer is Derek Iversen's face.
- SpongeBob develops boogophobia, a phobia of the boogeyman.
- It is revealed that Squidward has a mirror on his bedroom ceiling.
- The episode jumps out off topic, from night light matters to a Mermaid Man and Barnacle Boy conflict.
- The opposite happens in "Have You Seen This Snail?" where it was meant to be a Mermaid Man and Barnacle Boy episode, but then went to a "where is it?" plot.
- Double irony: A normal child with a fear of the dark would usually sleep with only one night light. SpongeBob, out of desperation and fear, buys way too many night lights to light up the pineapple in the most impossible way since one night light is not enough for him and he is not able to get any sleep until the end of the episode.
- This is the first time SpongeBob wears green pajamas to bed instead of his underwear.
- This is the first appearance of Mermaid Man and Barnacle Boy in an episode that does not have their names in the episode title.
- Chronologically, the unofficial name of the episode is "Mermaid Man and Barnacle Boy VII," but the sequencing stopped after "Mermaid Man and Barnacle Boy VI: The Motion Picture."
- This is the last episode written and storyboarded by Chris Mitchell.
- This episode premiered on Jim Wise's 43rd birthday.
- This episode was paired up with "Yeti Krabs" during the Massive Monster Mayhem Marathon.
- According to the episode's production code 5574-435, this is a holdover from the later run of the fourth season's production cycle. Reasons for why it was delayed until season five is unknown.
- The Big "M" signal in the sky is a reference to the Bat-Signal from Batman.
- The Moth resembles the famed monster, Mothman, with wings and red eyes.
- The Moth looks similar to Superman (even though he is a bad guy whereas Superman is a good guy) and the Owlman.
- When Mr. Krabs picks up SpongeBob, his claw is way bigger than normal.
- When SpongeBob is carrying a bunch of night lights, he disappears just before going off-screen.
- Patrick looks out a window thinking SpongeBob is having a party without him. However, most of Patrick's house is underground, so this is impossible and Patrick never had a window in other episodes.
- Also, when Patrick watches SpongeBob's house, he sees it from an impossible angle, because Squidward's house is between them.
- When SpongeBob asks what Patrick is doing, there appears to be a few frames of animation cut and Patrick starts talking within one frame.
- When Patrick is in SpongeBob's mouth after Squidward scares them, he comes out after Squidward tells them it is him, but without his sleeping hat. The next shot where Patrick is seen, his sleeping hat is back on his head.
- When the lighthouse shines its light through the pineapple, at first the "M" looks like it has more of a curve, but when Mermaid Man finds out the signal is a false alarm, the signal looks like a normal "M."
- When SpongeBob asks Mermaid Man and Barnacle Boy if they are at his house to protect them from the darkness, he does not have any legs.
- When SpongeBob and Patrick meet Mermaid Man and Barnacle Boy, they are all outside. After the shot with the letter "M," they are all in the pineapple.
- Mermaid Man takes a nap beside Patrick’s rock in SpongeBob’s pineapple after attempting to fight Moth. However, when SpongeBob walks up the lighthouse, Mermaid Man is gone.
- When Moth lifts up SpongeBob's entire pineapple, only the very top should go since it is detached from the rest of the house.
- SpongeBob getting more night lights from the store.
- SpongeBob scared of anything dark.