Nanomech is a miniature carbon-silicon-based life form, introduced in the film Ben 10: Alien Swarm. He is a Nanomechian from the hive planets. He can also alter his body to adapt to any situation. Being a part of the chips' hive mind however renders him vulnerable to the Queen's link to the other chips, though unlike the drones he retains his individuality. It's worth noting he is drastically different than the source alien, which are insect-like while Nanomech takes on a humanoid shape.

He appears for the first time in the Ultimate Alien episode, "Video Games" , with his appearance and voice changed. Ben transforms into him so that he could be in a supposed video game he was going to be in. Later in the episode, he was used to tear apart the insides of Will Harangue's robot.