I don't usually watch the shows and cartoons that Sean Marquette is in, so I don't really know his full potential. He does, however, do two voices from two of my favorite shows. One of them is Sam Dullard from Rocket Power. I know he only did Sam's voice for a short time, but he was still pretty good. I couldn't even tell the difference between the original voice actor and Sean. Another voice is Mac from Fosters Home for Imaginary Friends. Mac is one of my favorite characters - mainly because of his voice. It's not too deep, but it's not high pitched and squeaky like some other characters are. It's right in between and it's perfect for Mac's personality.