By Michael Ausiello
August 11, 2010 at 04:59 PM EDT

Image Credit: Anthony G. Moore/PR Photos; NickelodeonThink iCarly fans don’t know jack? Think again.

Jack Black has signed on to guest-star in an episode of Nickelodeon’s kiddie phenom, sources confirm to me exclusively.

Black—who twice hosted Nickelodeon’s Kids’ Choice Awards (in 2006 and 2008)—will play Spencer’s (Jerry Trainor) videogame nemesis, Aspartamay. The rivals come face-to-face at the show’s version of Comic-Con, Webicon.

The episode goes before the cameras this week and is slated to air later this season.

In related news, this is my second iCarly story this summer. I’m broadening my base!

TV scoop is best served instantaneously, so follow me on Twitter via @michaelausiello