Prosecutors say the man threatened to beat, torture, impale, dismember and decapitate Judge David Certo, who is presiding over another case involving Flash.
Flash claims to be the leader of a group called "Vampyre Nation." A call to a phone number listed on the group's blog got a recording saying the call could not go through.
The Associated Press called Flash's public defender for comment after hours, but the office was closed and didn't have an answering machine.