Chill for a Day

Chill for a Day is a Ben 10: Ultimate Alien book that was published by Scholastic and written by Aaron Rosenberg.
==Plot==
When Ben gets stuck in an Ultimate Alien form, chaos breaks loose!
When Ben as Ultimate Big Chill decides to take on a mysterious alien alone one night, the alien throws chemicals at him and gets away. Ultimate Big Chill tries to transform back into Ben, but he can't-he's stuck! With a looming chemistry test and a strange alien to catch, Ben can't take a day off. He has to go to school in alien form to take his test and look for the alien between classes. Luckily, the alien turns out to be a good guy who just needed a sample of Earth water and Ben is able to change back by using some other chemicals!
==Characters==
*Ben Tennyson
*Max Tennyson
===Villains===
*Unnamed alien
==Aliens Used==
*Big Chill
**Ultimate Big Chill
==Errors==
*The narrator mentions that the Omnitrix was upgraded to the Ultimatrix, which is not the case, as they are two separate devices.
Category:Merchandise
Category:Books