A shapeshifting chameleon monster used to infiltrate Hillhurst Mansion. He could disguise himself as any house monster, even Flabber. Changeling captured Flabber in a jar and took over his identity. At one point he even disguised himself as Drew. Roland defeated the Changeling with his Metallix Grappler. His picture was seen among the many of Les' drawings that were combined with toxic chemicals and Nukus' powers to create Repgillian.