The Angry Alien is a book in the Capstone series as a part of the Scooby-Doo! Solves It with S.T.E.M. line.
Summary[]
The aliens have landed! That's what Scooby-Doo and the gang think when they see a UFO and an alien who seems determined to destroy the local lighting store. But why? Join the gang as they use science to uncover the alien's mission and put a stop to its not-so-bright idea.