Before Family Guy debuted on Fox in 1999, creator Seth MacFarlane produced a rough, unfinished pilot in 1998 to pitch the series. This "lost" pilot was a lower-budget version of what would later become the first episode, Death Has a Shadow.
The pilot featured early designs of the Griffin family, with some noticeable differences. Stewie looked more sinister, and Brian had a more exaggerated, dog-like appearance. Some voices, particularly Meg’s, were also slightly different from the final series. The animation was rougher, as it was produced on a limited budget with MacFarlane himself handling much of the work.
Fox executives liked what they saw and greenlit the show, giving MacFarlane a much bigger budget to refine the animation and writing.