American Dad! Season 13 Episode 1 Roots Episode Title:Roots.Episode Description:Stan is in favor of a new football stadium being built in Langley Falls, until he learns its construction will destroy a sacred tree from his childhood. Meanwhile, after Steve learns that he hasn't grown an inch in several years, he considers surgery to increase his height, and turns to a child physician named Dr. Calgary, whom Steve discovers is actually a mad surgeon from Germany.