Well you heard about it here back in September 2008, but YouTube’s most-subscribed “Fred” finally makes his appearance on Nick’s iCarly. The episode airs on Nick this Monday, February 16 at 7:30 EDT (source). 

In this debut for Fred, iCarly’s Freddie (played by Nathan Kress) declares his disgust for Fred, and Fred stops making videos. See Fred’s promo below…