Wikipedia
"Surro-Gate" is the seventh episode of the fourth season of American Dad!. It originally aired on December 2, 2007. This episode mainly centers around Stan, who hears the news that Greg and Terry are having plans of starting a family through in vitro fertilization. Stan at first takes this as a joke, and tries to convince them to remain without children. When Greg and Terry have trouble finding a donor, Francine offers to be the surrogate for the couple's child. Stan is enraged when he finds out that his wife is the surrogate for Greg and Terry's baby, and he later vows to take the infant to Nebraska to put her up for adoption. Meanwhile, Roger and Steve play a trick on Klaus, only for him to seek revenge on the two.
This episode was written by Erik Durbin and directed by Tim Parsons. It featured guest appearances from Jane Lynch, Leisha Hailey, and Mary Jo Catlett, as well as several recurring guest voice actors and actresses for the series.