artists' alleys can include writers and even models. Academics and comic industry professionals annually hold the Comics Arts Conference at Comic-Con, presenting scholarly studies on comics as a medium. In recent years, the number of television shows that are promoted far outnumber films. During the 2011 convention, at least 80 TV shows were represented, compared to about 35 films. The shows not only promote in the exhibit halls, but also use screenings and panels of various actors, writers, producers, and others from their shows. Premium cable channels HBO and Showtime have used the con to promote programs like Game of Thrones (HBO), Dexter (Showtime), Shameless (Showtime) and True Blood (HBO). In 2013, there were 1075 total panels held during the convention, the plurality of which were anime-focused (29%), followed by comic-focused panels (26%). 1036 vendors participated in the convention in 2013. There are at least 17 separate rooms in the convention center used for panels and screenings, ranging in size from 280 seats to 6,100 seats. The two biggest are Ballroom 20, which seats approximately 4,900; and Hall H, which seats just over 6,100. The neighboring Hilton Bayfront is also used, with its main ballroom (Indigo) seating up to 2,600. The other neighboring hotel, the Marriott Marquis & Marina, also hosts a lot of Comic-Con activity. Among other things, the hotel serves as the anime headquarters and is where the nighttime films are shown. Exclusive collectibles In the 21st century, the convention has drawn toy and collectibles designers who sell "Comic-Con Exclusive" products. Such companies have included Lego, Hasbro, Funko, Gentle Giant LTD, Mattel, NECA, ThinkGeek, Sideshow Collectibles, Entertainment Earth, Bif Bang Pow!, Mezco, Toynami, and Kotobukiya. Most such exclusives are licensed properties of film, comic book and animation characters. In the media Comic-Con International has served as the setting for Mark Hamill's Comic Book: The Movie, and for an episode of the HBO television series Entourage, the latter of which, while set at the event, was not filmed there. Comic-Con also served as an excuse for the fictional characters Seth Cohen and Ryan Atwood's trip to Tijuana, Mexico in episode 7 ("The Escape") of the first season of TV series The O.C. The convention also featured prominently as a setting for the Numb3rs episode "Graphic". In season 4 of Beauty and the Geek, an episode was featured where the contestants traveled to Comic-Con 07 and were given a challenge