Season 13

Season 13 of Arthur premiered in the United States on October 12, 2009 on PBS with "No Acting, Please" and ended on April 9, 2010 with "The Secret Origin of Supernova."

Episodes

Screenshot	Title	Number	Episode	Original Airdate
	"The Great MacGrady"	156	1	October 19, 2009
	Mrs. MacGrady is diagnosed with cancer and the kids react differently. Arthur and D.W. rush to her support, Francine is scared, and Muffy is initially unaware of the symptoms, but jumps to action when she realizes how to help. Lance Armstrong guest stars as himself for the second time.
	"The Silent Treatment"	157	2a	October 13, 2009
	George wonders whether anyone would notice if he just disappeared, and so vows not to speak until someone notices him. Of course, his friends do notice, and they decide to cheer him up with a surprise party.
	"Kung Fool"	157	2b	October 13, 2009
	Fern volunteers to help an elderly neighbour, Tony Wu, with his household chores, and then discovers his past life as a Kung Fu celebrity. Suddenly she imagines herself as his student, and she will soon be a Kung Fu master herself! But will she be disappointed to learn that dish cleaning and laundry folding are not really part of some special martial arts training? Or can she learn a valuable lesson in acceptance and friendship?
	"Arthur's Number Nightmare"	158	3a	October 14, 2009
	Buster finds a piece of paper with names of his classmates and numbers beside them. He, Arthur, Francine and their class believe it's a class ranking system based on behavior, and Everyone tries to find ways to have a higher rank.
	"Brain Gets Hooked"	158	3b	October 14, 2009
	The Brain's addiction to a reality show called Junior Island falls him behind his schoolwork.
	"MacFrensky"	159	4a	October 15, 2009
	Francine and the Brain are competing for Student of the Month. He is in the lead and Muffy wants her to win. Francine and Muffy frame him into doing a bad deed, so Francine becomes Student of the Month. They continue to frame other students in fear of being caught from their first plan.
	"The Good, the Bad, and the Binky"	159	4b	October 15, 2009
	Binky introduces Emily into wrestling when he babysits her. Her personality changes from being nice and polite to being loud and rough. He changes her back to her normal self when she begins to hurt other children in result of her behavior.
	"No Acting, Please	160	5a	October 12, 2009
	When Fern lands a role in the Elwood City community production of It Began with a Whistle, she fears that she isn't talented enough to be a star actress. But director William Fillmore Toffman, voiced by Philip Seymour Hoffman, teaches her how to have fun, be herself, and truly shine.
	"Prunella and the Disappointing Ending"	160	5b	October 12, 2009
	The final volume of the Henry Skreever series, "The Knights of the Bouillabaisse", is released at last. Prunella and Marina compete to see who will be first to finish it, but they soon learn that speed reading does not always pay off.
	"When Carl Met George"	161	6a	April 5, 2010
	George meets a new friend named Carl, who has Asperger's syndrome—a form of autism. George is unsure about how to act around him, but the Brain helps put autism in perspective for him so he can understand some of Carl's mannerisms.
	"D.W. Swims with the Fishes"	161	6b	April 5, 2010
	D.W. and James enter the preschool swim meet and recruit their older siblings to coach them. It all goes well until Arthur and Molly begin to get more competitive than them.
	"A Portrait of the Artist as a Young Tibble"	162	7a	April 6, 2010
	The Tibble Twins sell their artwork to raise money for a toy by using pity.
	"The Secret Guardians"	162	7b	April 6, 2010
	Arthur, Sue Ellen, and Binky find a woodland oasis near their homes and vow to keep it a secret. Soon they start to find evidence of human habitation and wonder if they've discovered an ancient civilization.
	"Fernlets by Fern"	163	8a	April 7, 2010
	Fern and Muffy start a greeting card business. Muffy paints the covers and Fern writes the poems. All the work makes Fern lose interest in writing, so she tries to figure out how to get make it interesting again.
	"Prunella and the Haunted Locker"	163	8b	April 7, 2010
	Prunella is assigned a new locker, which is rumored to be haunted. She learns how to be brave and face her fears.
	"Paradise Lost"	164	9a	April 8, 2010
	Kate begins to learn to talk, but starts to not be able to understand Pal anymore. They go to the Dolly Llama for an answer.
	"The Pride of Lakewood"	164	9b	April 8, 2010
	To boost school pride, Arthur and his classmates form the Lakewood Pride Committee, which seems to pressure and brainwash students to have pride for their school. Sue Ellen and the Brain don't join the group and are accused of not loving their school.
	"Looking for Bonnie"	165	10a	April 9, 2010
	Famous rock musician Dean Lomax visits Elwood City and asks George's dad to fix his guitar.
	"The Secret Origin of Supernova"	165	10b	April 9, 2010
	Arthur is dismayed when he learns that the energy drink endorsed by Dark Bunny, his favorite superhero, is unhealthy. He goes in search for a new superhero who doesn't sell out from their principles, and ends up making his own named Supernova.

Trivia

• In some non-US markets, this is the last season to be in the 4:3 SD format.
• On PBS airings in the U.S., this is the first season where the official PBS Kids web address is seen at the beginning of the end credits of every episode.
• This is the last season where Samantha Reynolds voices George. Eleanor Noble will be back for the role in the next season.