Weirdo Halloween

Weirdo Halloween is the sixteenth book in the Goosebumps HorrorLand book series, and the fourth book in the Chiller House arc. It was first published in 2010.

The cover shows Bim, an orange alien, holding a bag of candy.

Plot
On October 30th, brother and sister Chris and Meg Oliver rescue a young child in a costume stuck in a bush. But, they discover the "child" is really Bim, a smelly alien with a lot of disgusting habits. Bim promptly swears allegiance to them. On October 31, Bim's people invade Earth. The twins find their souvenir from HorrorLand maybe the only thing that can save or harm them! In the third part of the story, Meg returns to HorrorLand and is sent on a mysterious mission by Jonathan Chiller. Meg also spots another her running around. It turns out that the other Meg and Chris were robots and while Meg was tuggging at Chris's ears they fell of and Jonathan Chiller was sad because she broke the robot so she was sent home again.

Alternative cover
In Brandon Dorman's original artwork, Bim's skin is green and has purple eyes. However, when the book was released, his skin was changed to orange. The book was later reprinted to have Bim's skin as green, and his eyes were changed from purple to orange. Other changes include the artwork being more zoomed-in, and a "SPECIAL EDITION" banner was added underneath the Goosebumps HorrorLand logo.

Trivia

 * With 214 pages and over 34,000 words, this is the longest Goosebumps book ever. The book Goosebumps Wanted: The Haunted Mask is 240 pages long, but it has a lower word count than Weirdo Halloween.
 * During the Halloween party Meg clearly known that alien costume is worn by Carlos and he said " How do you know it was me?" this line belongs to the Halloween special It's the Great Pumpkin, Charlie Brown.
 * During the third part of Weirdo Halloween Chris has to give the questions to both Megs to see which Meg is the real Meg, this is referred to one of the of the Spongebob Squarepants "Imitation Krabs".