Gadget and her fellow Rescue Rangers were originally ordinary rodents. However, they had their intelligence enhanced by F.O.W.L. scientist and agent Black Heron. Gadget was the first of the group to be so altered, and quickly fashioned clothes for herself and began walking upright. She and the other Rangers eventually staged a breakout, during which incident they met and befriended Launchpad.
After helping him escape F.O.W.L. Headquarters and thwart a scheme by Steelbeak, Monty and his companions left for parts unknown. They were eventually recaptured by F.O.W.L. and imprisoned at the Library of Alexandria along with many other beings and relics associated with adventure. They joined in cheering on Launchpad as he once again faced off with Steelbeak. After being liberated, they were among the allies of the Duck family to join them in a final confrontation with Bradford Buzzard.
Behind the scenes
The DuckTales 2017 version of Gadget's design and upcoming appearance were teased in 2019 at a convention.