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

The cover artwork shows Bim, an alien, trick-or-treating. He's on a porch, holding a Halloween bag that contains lots of candy.


"It's the only one I've ever seen. Maybe the only one on Earth."

After a trip to HorrorLand, Meg and her brother, Chris, can't wait to celebrate Halloween. Until that Weirdo in the baby alien costume shows up and begins to wreak havoc on their lives. They just can't seem to get him to leave. And Meg's beginning to suspect that his orange skin isn't a halloween disguise. . .

What happens in the world's scariest theme park on the most frightening day of the year? Meg is about to find out when she's mysteriously called back to HorrorLand on Halloween. Can she survive the trick or treachery?


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.

International releases

No. Book Country/Language Translated title Release date Publisher

Dolcetto o Scherzetto?



Trick or treat? 2011 Mondadori

L'Extraterrestre de la Planète Cinglée



The Extraterrestrial of the Loony Planet June 2014 Bayard Poche

Um Dia das Bruxas Bizarro

Um Dia das Bruxas Bizarro


A Bizarre Halloween 2014 Editora Fundamento



Goosebumps HorrorLand series
#01 Revenge of the Living Dummy#8 Say Cheese — and Die Screaming!#15 Heads, You Lose!
#02 Creep from the Deep#9 Welcome to Camp Slither#16 Weirdo Halloween
#03 Monster Blood for Breakfast!#10 Help! We Have Strange Powers!#17 The Wizard of Ooze
#04 The Scream of the Haunted Mask#11 Escape from HorrorLand#18 Slappy New Year!
#05 Dr. Maniac vs. Robby Schwartz#12 The Streets of Panic Park#19 The Horror at Chiller House
#06 Who's Your Mummy?#13 When the Ghost Dog Howls
#07 My Friends Call Me Monster#14 Little Shop of Hamsters