In the 13th-season premiere, Bill's love of sweets gives him diabetes, which forces some changes in his lifestyle. Thunder: Jake Steinfeld. Dr. Weissman: Scott Klace.
A scandal at Strickland Propane prompts Hank to suggest the company "go green," starting a run of eco fever in Arlen. Bobby and Joseph plant trees for extra credit in school, while Dale gets an idea for a fraudulent carbon offset business.
Ted Wassonasong, Kahn's idol, buys an abandoned house in the neighborhood, but he doesn't plan to live there. What he does plan will change the neighborhood---and not for the better.
Strickland Propane goes digital with a page on MySpace that Donna designs, and she's promoted to assistant manager of new media. Business picks up at first, but soon there are problems.
The students at Tom Landry Middle School have not been doing well on standardized tests, putting the faculty in jeopardy because of "No Child Left Behind." So Principal Moss comes up with a scheme to get around the law, and it affects Bobby.
Peggy wants a big flat-screen TV and figures out a way to get it: She invests in companies that make things that "average American consumer" Bill buys.
Hank and a new neighbor (voice of Andy Richter) lock horns over how to run the local chapter of a boys group called the Order of the Straight Arrow.
Peggy throws a baby shower for Luanne, and Lucky's sister Myrna and her children attend. Eventually, Myrna and Peggy end up clashing over how Luanne will raise her child: Peggy's parenting skills are old-fashioned while Myrna's are modern and by the book.
Buck Strickland is inducted into the Propane Hall of Fame and asks Hank to accompany him to the convention in Memphis to keep him out of trouble. That task becomes harder when Buck meets his illegitimate son (voice of Diedrich Bader) at the event.
Peggy and Hank's date runs long, and they forget to pick Bobby up at the mall. Bobby uses their guilt to start a war for his affection, but his strategy backfires when Peggy and Hank stop giving him everything he wants and offer to spend time with him.
Hank and the gang get a rematch for the high-school football championship game they lost, and Hank breaks his nose during a practice. He gets it fixed by a plastic surgeon and loves his new nose---maybe too much.
When Peggy realizes she's uncool, she befriends Katt Savage (voice of Kate Walsh), the coolest mom at Bobby's cotillion classes. When Katt invites Bobby and Peggy to her daughter's coming-out party, the Hills dress to impress and act sophisticated.
Nancy Gribble takes a job as a newswoman in Dallas, and Hank is assigned to watch Dale while she's away. When Dale goes wild, though, Hank and Peggy beg Nancy to come home.
Bobby's misbehavior rankles Hank, but Lucky offers Bobby an intervention at his church. Meanwhile, Hank and the gang face off against a rival neighborhood in a Fourth of July fireworks showdown.
Hank receives a package of his late father's belongings, including war medals, his uniform and a tape explaining his last wishes.
Bobby's baseball career has its ups and downs after he signs up for a new little league, and friction develops between Hank and the new coach (voice of David Herman).
Luanne becomes a children's entertainer with her manger baby puppets, and aspiring agent John Redcorn makes her the star of a children's DVD. Meanwhile, Dale writes a children's book about a gun and her little lost bullet.
Boomhauer swaps houses with a Canadian family for the summer and gets friendly with his temporary neighbor, Suzette, in the 13th-season finale. Meanwhile, the Hills have some friction with their new Canadian neighbors.