<P> Stewie is one of the show's biggest merchandising icons, and he has been included on Family Guy T - shirts, baseball caps, bumper stickers, cardboard standups, refrigerator magnets, posters, and several other items . Stewie appears in the Family Guy Video Game!, where Stewie discovers Bertram attempting to outdo him in taking over the world . Desperate to stop him, Stewie shrinks himself and makes his way to Bertram's lair within Peter's testicles to discover his plan, destroys his henchman cloning lab, and rescues a kidnapped Rupert from a rocket . He finally confronts Bertram in the park, where Bertram turns himself into a giant . Stewie Griffin: The Untold Story is a DVD movie about Stewie's secret and what can possibly be his future . Stewie is also a playable character (along with Brian) in the show's second video game, Family Guy: Back to the Multiverse, where the pair travel through the multiverse again, in order to defeat Bertram . </P> <P> Stewie appeared in Bones, eventually revealed to be the result of FBI Special Agent Seeley Booth's (David Boreanaz) brain tumor . Seth MacFarlane wrote all of Stewie's dialog for the episode . The character appeared in a Coca - Cola commercial during Super Bowl XLII, he and Brian appeared in a commercial for Wheat Thins, he presented a musical number at the 59th Primetime Emmy Awards with Brian, and he appeared at the 62nd Primetime Emmy Awards . He was on the Late Show with David Letterman to present "Top Ten Things You Don't Want To Hear From Your Child ." </P> <P> There is much debate over which characters in Family Guy can understand Stewie . In an interview, MacFarlane said that everyone can basically understand him, but they ignore him or just think to themselves "oh how cute" when he talks . However at the 2011 ComicCon panel, he compared this to Wile E. Coyote in the old Merrie Melodies cartoons . MacFarlane went on to say that Brian always hears Stewie, and more recently so does Chris, but the writers usually strive for Peter, Lois, and Meg not to hear him . Once Stewie leaves the house, the question of who can hear him depends very much on the story . MacFarlane also states that these rules can be broken for the sake of comedy, so this could change from one episode to another . In "Inside Family Guy", Peter apologizes to the family, to which Stewie comments: "Oh that's nice of you to say". Peter replies: "Thank you, Stewie, who I can understand", referring to the ongoing discussion whether or not family members, other than Brian, are able to understand him . However, Peter's response seems to be a part of the episode's offset setting, where everyone is out of character . </P>

Is brian the only who can hear stewie