A new breed of rat which possesses electric bacteria in its body (scientific name: Electricamus) grows to human-size and turns violent after receiving electric stimulation. Hiding out at the research facility of Kawami Heavy Industries, it got an electric shock in the dimode generator control room, which further enhanced its fusion at the cellular level and caused it to grow further into a gigantic electro rat kaiju.

A cable leading to a dimode generator extends from its lower right back. Nezutron absorbs electricity by taking in dimode through this cable, but the excessively continued operation of the dimode generator may cause a major explosion.

The head of the Nezutron is covered with scales in the shape of an armor, and its thrusting attack can even break through Ultraman Arc’s Arc Giga Barrier.