Spidermonkey

Ben firsts transforms into Spidermonkey when he has to fight off his Anodite grandmother in the episode "What Are Little Girls Made Of?".

Abilities
Spidermonkey is an alien with 4 arms, 4 eyes and 2 legs, a feature Spidermonkey has in common with Fourarms. Spidermonkey can spin webs from his tail, has supernatural adhesive skills, and has superhuman agility.

Weaknesses
Although incredibly agile it can get tangled by its own web.

Origins
Spidermonkey is an Arachnichimp from the planet Aranhaschimmia. The name "Arachnichimp" is derived from arachnid, the name of a group of animals including spiders, scorpions, and ticks, among others, and chimpanzee, a type of ape. Oddly, Spidermonkey has a tail, a feature chimps (and indeed, the hominids as a whole), do not posess. Spidermonkey always has to watch its back on his planet, bicause Arachnichimps are the most delicious creatures on his planet and has to hide in trpical rain forests of Aranhaschimmia.