Muggshot is the second member of the Fiendish Five that the Cooper Gang encounter in Sly 1. The Cooper Gang track down Muggshot in Mesa City, which Muggshot has evidently taken over. The Cooper Gang discover that Muggshot is located within a casino in the city, which is heavily guarded. The Cooper Gang then venture to find a way past the heavy security of the casino in an attempt to reach and confront Muggshot.
Muggshot was bullied and made fun of as a young pup by others. As a result, he was lonely, but felt a connection with the tough criminals he saw in the movie theaters. These criminals appealed to Muggshot- they were rugged, mean, and certainly weren't bullied. It was then, that Muggshot decided to make a change. He dedicated his life to becoming a buff, brutal gangster who always packed a couple of pistols. Muggshot then got revenge on his childhood bullies and never looked back.
Muggshot then started making a name for himself as he became more and more vicious and notorious. Muggshot was eventually discovered by Clockwerk, the Fiendish Five leader, and officially became part of their group as the enforcer. Muggshot had finally made it as the gangster he once admired as a pup on the big screen. Ultimately, Muggshot went from being bullied, to becoming a bully.