The Simpsons and Family Guy havent historically been on the best terms. In 2005, a joke on The Simpsons took a dig at the shows similarities, which Seth MacFarlane said was definitely a slam. But it appears theyve buried the hatchet — mostly. The Simpsons and Griffins will meet in a cross-over episode of Family Guy airing September 28th on Fox. During a Family Guy panel at Comic-Con, attendees were given a sneak peek at the episode, and now its available for the world to see.