|"The Boy Who Cried Comet"|
|Number in season:||5a|
|Original Airdate:|| October 22, 2001|
January 9, 2002
|Written by:||Peter K. Hirsch|
|Storyboard by:||Elie Klimos|
"Brother, Can You Spare a Clarinet?"
"Arthur and Los Vecinos"
Arthur walks through a desolate area. He tells the viewers to imagine they could go to another dimension where teachers are aliens (Mr. Ratburn appears and pulls his mask off, revealing he was an alien), principals who are robots (Principal Haney appears as a robot and explodes) and more UFOs than stars in the sky. He then concludes the intro, saying "Your next stop, the Buster Zone."
Arthur and Fern are at Arthur's locker when Buster rushes up to them, saying that something is happening. They go over to the ice cream parlor, where Buster explains that he saw a fleet of UFOs the night before. Brain debunks this theory, saying that it is crazy.
Determined to prove him wrong, Buster (along with Arthur) sets up a telescope that was borrowed from Muffy and looks through it. One night, after several failed attempts, Buster discovers a comet. He soon finds out that a comet is expected to hit Earth in 37 days. Later that night, he dreams about a comet hitting Earth after Bionic Bunny fails to stop it from doing so.
The next day, Buster tells Arthur about the comet as well as a few other kids, but they pay no attention. Buster then turns to Brain, who reluctantly agrees to see if Buster's findings are correct.
At the treehouse, Brain confirms that Buster was right, confirming that a comet is actually bound for Earth. As the others run around screaming, Fern steps on a screw and finds out that it was missing from the telescope. The next day, Fern explains to Arthur and D.W. that the missing screw was the reason why the readings were wrong. Buster and Brain show up with newspapers that talk about Buster's comet discovery.
In the end, it is revealed that there is an alien director and that the kids are actually portrayed by alien actors.
- 3rd Grade Female Aardvark (Number 2)
- 3rd Grade Male Rabbit
- 3rd Grade Male Cat
- 3rd Grade Male Dog
- 3rd Grade Female Aardvark
- 3rd Grade Male Dog (Number 3)
- 3rd Grade Male Rat
- 3rd Grade Female Cat (Number 2)
- Maria Pappas
- Prunella Deegan
- Sue Ellen Armstrong
- Timmy and Tommy Tibble
- Amanda Hulser
- The telescope part that Fern picked up appears to be a fastening bolt for the telescope tripod and the telescope, however this part does not appear to be a computer part, so the computer shouldn't have malfunctioned without it.
- The fact that Ratburn pulled off his head to reveal he was an alien in the teaser is a reference to the episode's ending.
- When Arthur and Buster pull off their rubber masks, their alien forms are seen. However, Brain's, Fern's and D.W.'s alien forms are not seen. However, as the screen zooms out to show Arthur-alien and Buster-alien walking out, if the screen is paused at the right time, the viewers can see a yellow alien wearing a pink dress (D.W.), a purple alien with a white shirt (Brain) and a blue alien with a purple shirt (Fern) walking away.
- The Justin Bradley version of this episode story is available on the VHS and DVD editions of Arthur Gets Spooked.
- The newspaper refers to Buster as "Cat Saver," referencing the name given to him for his actions in "Buster Baxter, Cat Saver."
- The International Space Station appears again in "Buster Spaces Out."
- The title is a reference to one of Aesop's fables, The Boy Who Cried Wolf.
- The opening of this episode is a parody of the opening of the show The Twilight Zone.
- Mrs. Marble's "Handbook for Young Detectives" alludes to Miss Marple, a fictional amateur detective created by Agatha Christie.
- The way the aliens in Buster's fantasy communicate with colored lights and sounds is a reference to the film Close Encounters of the Third Kind.
- Buster mentions Heather McCurdy who, with two other high school students, discovered an asteroid (not a planetoid) in 1998.
- The ending where the show's main characters unmask to reveal they are just disguises/fictional characters is similar to an episode of The Ren & Stimpy Show entitled "Aloha Höek," though in that case the title characters similarly remove their masks to reveal they are human Russian communist spies in disguise, apparently on some kind of mission, compared to Arthur and the gang really being aliens acting out the show on the moon.
- D.W., the Tibble Twins, and several preschoolers are seen briefly in the background when Buster climbs up the jungle gym.