Creeps (Goosebumps)

Creeps are a race of alien lizard beings in the Goosebumps book Calling All Creeps. Their goal is to transform everyone in the school into a Creep and eventually do the same to the entire world. Ricky, the protagonist, tries to save his classmates at first, despite the fact that they bully him constantly. However, when he learns that he will be the leader of the Creeps, he lets them succeed in their plan and voluntarily becomes a Creep himself.