Jack Black gathers up Miranda Cosgrove in his arms in this new still from iCarly.

In the upcoming episode “iStart a Fan War,” Carly (Cosgrove) and the gang are invited to host a panel at WebiCon, but the session is derailed when they are put on the spot by die-hard fans who demand to know whether Freddie (Nathan Kress) is dating Carly or Sam (Jennette McCurdy) and the “Creddie” and “Seddie” sides break out into an all-out fanboy riot.

Meanwhile, Spencer (Jerry Trainor) earns the adoration of fellow WebiCon attendees when he arrives impeccably costumed as an avatar from his favorite medieval-themed online video game. However, Spencer’s euphoria is cut short when he comes face-to-face with his online nemesis, Aspartamay (Black). Surrounded by an army of costumed WebiCon devotees, the two competitors launch a fan war like none other featuring their most impressive “wizard powers” and most biting lyrical warfare in the form of an operatic battle opus.

Miranda shared about reuniting with Jack (they starred in School of Rock together), “Jack Black is one of the funniest people I know, and it was wonderful working with him again. He kept the entire cast and crew laughing in between takes with hilarious riffs of the battle song he sings in the episode.”

Creator Dan Schneider added, “His role was very demanding and he worked his butt off and was a pleasure every minute. Jack is hilarious and the consummate professional – if he ever needs a kidney, he can have one of mine.”

“iStart a Fan War” premieres Friday, November 19 @ 8PM ET/PT on Nickelodeon.

Bigger pic inside…