|Abilities|| Sharp Teeth|
|First Appearance||Max Out|
Xenocytes are small purple creatures with a singular eye containing a red pupil, a small black slit iris and green sclera. They have six tentacles, a visible brain and a black line which runs down the center, around their eye and mouth.
As they attach to their host, they take over the personalities of the people they possess and control them by hacking their DNA. Within hours, the Xenocyte will completely cover the host's body, transforming him into a DNAlien. Xenocyte eggs are created from an egg-laying machine. The eggs hatch underwater in large artificial green rivers. After hatching, the Xenocytes are stored in boxes filled with DNAlien slime. The Xenocyte eggs were going to ship out all throughout the country, but they failed.
It is revealed in the video game Ben 10: Alien Force that Xenocytes can turn other alien species into DNAliens; not just humans. These examples include DNAliens of Pyronites, Vulpimancers, Florauna, Osmosians and Null Guardians. However, they seem incapable of turning silicon based lifeforms like Crystalsapiens into DNAliens.
In the Ben 10: Ultimate Alien episode Simian Says, Arachnichimp bounty hunter Simian brought a Xenocyte queen home and sold it to a crime lord named Mizaru. When Mizaru released the Xenocyte, it infected him and began spreading more Xenocytes throughout all of Aranhaschimmia. Eunice, with the help of Simian and Ben's team, were able to reverse the effect and cure all the Arachnichimps, and destroy the Xenocyte that started it all.
Xenocyte is made of two words xeno, meaning "foreigner" or "stranger" and cyte meaning "cell".
- It has been confirmed that Xenocyte DNA was in the Codon Stream, it was sampled in Max Out, but the Codon Stream noticed that they are non-sapient, so it deleted the DNA.