Zeebo

Zeebo is a children's TV character featured in the episode "iCarly Saves TV". When a TV network producer tries to turn iCarly into a hit new TV show, he makes numerous questionable decisions, one of which is to introduce Zeebo the dinosaur, because of test market research showing that kids love dinosaurs.

Zeebo is actually just a man in a costume. Initially, he's played by a middle-aged actor whose claim to fame was appearing in a few episodes of the 1980s sitcom Full House. His tenure on iCarly lasts all of about two minutes before his attempts to upstage Sam and Carly during a rehearsal result in Sam beating him with a microphone. Zeebo is recast with Harper, a talented teenage musician who had originally been hired to provide music for iCarly until the producer decided to ditch the band in favor of more Zeebo. Harper is unenthusiastic about playing Zeebo, but plays along because of his contract. Sam gets annoyed with Zeebo, due to him being "annoying" and then Sam hit Zeebo with a microphone

Ultimately, the producer makes further changes to iCarly until it is no longer iCarly but a sitcom about a girl and a dinosaur, Zeebo (played once again by the original actor).

Trivia

 * Zeebo is a spoof of Barney the Dinosaur, although he looks more of a dragon than a dinosaur.
 * The man in the costume claims to be in a few episodes of Full House.