Although he looks the same as the other Watchdogs, he has a huge single-eye-glass over his eye, and also wears a lab coat.
He appears first in episode "The Big Job", where Wander and Sylvia join the Insurgent Generals, a rebel team set out to stop Lord Hater's latest scheme. According to Insurgent Generals leader; General Outrage, the Watchdog Scientist was developing a supossed diabolical invention, the HT-125-F, that was considered by Sylvia as a weapon of massive destruction. However, it results it was just a thermoregulatory for Hater's jacuzzi.
Later, he appears in the episode "The Hole...Lotta Nuthin" modifying mechanically Hater's right arm after he lost it.