iStart a Fanwar is the sixth and seventh episode of Season Four of iCarly, and 76th/77th overall. It is the season's first special (double episode). It includes various guest stars. It first aired Friday, November 19th, 2010. Jack Black, among others, is a guest star.
Carly, Sam and Freddie finally get to attend Webicon(see episode #3.17; iPsycho), and take Spencer with them. However when they arrive, Spencer meets an old nemisis, and the web hostesses find themselves caught in a heated rumor over which of the two girls are dating Freddie.