Sherry Goldsmith

Mary is a third grader in Miss Sweetwater's class at Lakewood Elementary.

The first time she spoke was in the episode, "Arthur's Substitute Teacher Trouble" as she spoke to one of her classmates and most likely friends, 3rd Grade Male Dog about the clouds in the sky. The second time she spoke was in the episode, "Buster Baxter, Cat Saver" and the third time took place in the episode, "Arthur and the Square Dance" when she said "Whoahh!" during the square dance at the school as she and the entire class fell to the ground, and the fourth time in "The Lousy Week". She is relatively a nice student as seen in many episodes.

In "Little Miss Meanie", her new name is revealed to either be Philomena Peckensniff or Griselda Dorffman.

Physical appearance
Mary is a sheep with a cream complexion. She wears a light gray turtleneck, a light yellow sweater over the turtleneck, dark yellow shorts, gray belt, yellow belt buckle, and brown loafers. She has blonde hair. In the episode, "D.W. Swims with the Fishes" she wore a light blue colored swimsuit.

Trivia

 * Mary is currently the only sheep character that has made regular reappearances in the series.
 * She has a one-time doppelganger, Unknown Male Sheep. This is similar to Beulah McInnerny and her doppelganger, Aloysius Zimmerplotz.
 * She is in Miss Sweetwater's class.

Cultural references

 * Her name is likely a reference to the nursery rhyme Mary Had a Little Lamb.

Production notes

 * Her name was never said on the show, but it was on her character modelsheet.

Specials

 * Arthur's Perfect Christmas
 * Arthur - It's Only Rock 'n' Roll
 * D.W. and the Beastly Birthday
 * Arthur and the Haunted Treehouse

Arthur''

 * Season 1
 * Arthur's Eyes 10101
 * Arthur and the Real Mr. Ratburn 10201
 * Arthur's Spelling Trubble 10202
 * Arthur Accused! 10602
 * Arthur Goes to Camp 10701
 * Arthur Writes a Story 11201
 * Arthur's Lost Dog 11202
 * So Long, Spanky 11301
 * Arthur, World's Greatest Gleeper 11702
 * Team Trouble 12202
 * Arthur's Substitute Teacher Trouble 12702
 * I'm a Poet 12801
 * The Scare-Your-Pants-Off Club 12802
 * My Club Rules (Miscolored) 12901
 * Season 2
 * Draw! 20102
 * Arthur's Lucky Pencil 20202
 * Buster Baxter, Cat Saver 20601
 * Arthur's TV-Free Week 20701
 * Buster Hits the Books 21102
 * Arthur and the Square Dance 21202
 * Fern's Slumber Party 21502
 * Love Notes for Muffy 21601
 * D.W. Blows the Whistle 21602
 * How the Cookie Crumbles 22001
 * Season 3
 * The Ballad of Buster Baxter 30102
 * Sue Ellen and the Brainasaurous 30302
 * Revenge of the Chip 30502
 * Meet Binky 30602
 * Arthur Rides the Bandwagon 30701
 * Dad's Dessert Dilemma 30702
 * Arthur's Almost Live Not Real Music Festival 31102
 * Arthur and D.W. Clean Up 31501
 * Season 4
 * The Fright Stuff 40302
 * The Rat Who Came to Dinner 40502
 * My Music Rules 41001
 * Season 5
 * Kids are from Earth, Parents are from Pluto 50201
 * It's a No-Brainer 50301
 * The Lousy Week 50501
 * The Election 50601
 * Sleep No More 50701
 * Season 6
 * Prunella's Special Edition 60301
 * The Good Sport 60901
 * Season 7
 * Elwood City Turns 100! 70500
 * Jenna's Bedtime Blues 70602
 * April 9th 71000
 * Season 8
 * Bugged 80302
 * D.W., Dancing Queen 80402
 * Vomitrocious! 80501
 * Sue Ellen Chickens Out 80502
 * Season 9
 * Francine's Big Top Trouble 90201
 * George Blows His Top 90202
 * The Law of the Jungle Gym 90302
 * A is for Angry 90702
 * Binky Goes Nuts 91001
 * Season 10
 * Happy Anniversary 100100
 * Desert Island Dish 100301
 * Do You Speak George? 100901
 * What's Cooking? 101001
 * Buster's Special Delivery 101002
 * Season 11
 * Germophobia 110102
 * Phony Fern 110401
 * Season 12
 * Ungifted 120402
 * The Cherry Tree 120601
 * Do You Believe in Magic? 120902
 * Season 13
 * The Great MacGrady 130100
 * Kung Fool 130202
 * D.W. Swims with the Fishes 130602
 * Prunella and the Haunted Locker 130802
 * The Pride of Lakewood 130902
 * Season 14
 * The Agent of Change 140201
 * Season 15
 * Fifteen 150101
 * I Wanna Hold Your Hand 150201
 * Buster's Secret Admirer 150301
 * Prunella the Packrat 150701
 * Season 20
 * Cereal 200202

Books
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 * Arthur's Off to School (2004)