When the thing from outer space visits earth on October 31, it is taken first for a trick-or-treater and then for a robot.
"It came from outer space" and most of the natives were unfriendly (a cow and a chicken), Luckily it was Halloween and the thing manged to find some friendly aliens out trick or treating. Buddy McGee invites the thing to his home only to discover that it is from outer space. They quickly become friends and the thing goes to school with him. Will he stay forever?
The subtle humor and bright, cartoon-y illustrations make this a great non-spooky Halloween read.