A common problem with a Merchandise-Driven piece of media is consistency between the media and the merchandise; whatever merchandise is made for the show or comic book has to look at least reasonably close to what's on the show or comic, and vice versa, for the kiddies to equate one with the other and, thus, buy both. This can prove a problem, though; marketing execs have a funny way of working their mojo, and it's not uncommon to see a chicken-or-the-egg scenario pop up - do they make the merchandise, then build the media around them, make the media then the merchandise, or make both together? Whichever one they pick is whichever manner the fans will judge the other on.