User blog comment:SpitfireVANS/Non-Speaking Roles???/@comment-5638184-20121019121616/@comment-1038387-20121019122905

And the "Shazam" he speaks is just recycled from an earlier episode.

About Billy, back in "Misplaced", it really irked me Uncle Dudley didn't speak. I mean, they had Corey Burton in the cast. Just give Nolan North the part of Wizard, and give Uncle D some lines already.