Spidermonkey is a species of Arachnichimp from the planet Aranhaschimmia. As the name suggests, it is a six-limbed monkey-like alien. It has superhuman agility and, like a spider, can spin webs from its tail and stick to walls. One member of the species was first seen in "What Are Little Girls Made Of?" to fight his grandmother Verdona Tennyson. When Ben transforms into Spidermonkey, he talks in an excited, childish tone and displays mischievous characteristics with occasional monkey-like screeching.