He played Screech in the television show Saved by the Bell. While he is not ugly, that goofy, lovable boyish charm that made him so popular has vanished. If his countless appearances on reality television shows are anything to go by, he does not seem to be the most savory character. In June this year he was sentenced to four months in prison after he was caught in possession of a switchblade knife after an altercation in a bar in Wisconsin.