Stanley "Stan" Leonard Smith is the main character of American Dad!. He has made a few cameo appearances in The Simpsons. He was pictured in the episode "The Italian Bob" and made a cameo in the ending credits of "Homerland".
In the episode The Italian Bob, in the American criminal book, alongside Peter Griffin. Stan is guilty of Plagiarismo Di Plagiarismo (plagiarism of plagiarism, which is the Simpsons writers' way of saying that American Dad! is a rip-off of Family Guy - despite both works having been created by Seth MacFarlane - which is already considered by Simpson writers — and detractors of Family Guy — as a rip-off of The Simpsons).
During the ending credits of the episode Homerland, Simpsonized versions of The Smith Family are seen at a 25th Season celebration for The Simpsons, along with families from other FOX cartoons, such as The Griffin Family, The Tubbs-Brown Family, and The Belcher Family.
Stan Smith is a strong and tall man with a big chin that has chiseled features. He has black hair. He has a dark blue shirt with a white undershirt and a black tie and a pin of the American flag on it. He also has black shoes.
Although Stan is, for the most part, a loving husband and father, he often causes problems within the home with his attitudes, possibly showing him having right-wing authoritarianism. Stan also seems to prize popularity; he encouraged Steve to date cheerleaders in "Pilot (American Dad!)". He is horrified when he discovers his son, Steve, is a geek and is reluctant to let the other C.I.A. agents see him, lest Stan become one of the uncool agents in "All About Steve". Though he appears to dislike nerds, Stan is shown owning a bat'leth, a type of Klingon sword in "Not Particularly Desperate Housewives". Stan is not particularly intelligent. He was even indirectly called a dumbass by one of Steve's teachers when he helped Steve's report on fossils in "Irregarding Steve". In "An Apocalypse to Remember", his family called him "the boob" because of his tendency to do unintelligent things and not think things all the way through.