Golfy is the "nerd" of the Monster Ball gang that originally invaded St. Damon's.

 

Being the little scientists that he is, Golfy theorized that he could chew his way into a human brain and take control over the body.  With the assistance of his fellow Monster Balls, Golfy took control over Brent's body and used him as a decoy to capture more prey for the clan.

 

 

Image from "Monster Balls!"

Golfy takes control of Brent who he hopes he doesn't have to sneeze.