Think 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.