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Jack Black is reuniting with his School of Rock co-star Miranda Cosgrove in a special one-hour episode of iCarly titled "iStart a Fan War."

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In the episode, Carly (Cosgrove) and her friends attend WebiCon, a Comic-Con-like conference for die-hard gamers. There, Carly's brother Spencer (Jerry Trainor) becomes a hit with his costume, dedicated to his favorite medieval-themed online video game. But his excitement is cut short when his nemesis Aspartamay, played by Black, challenges him to a duel.

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In the exclusive clip below, Black and Trainor go head-to-head in a hilarious lyrical battle.

iCarly's "iStart a Fan War" airs Friday, Nov. 19th at 8/8c on Nickelodeon.