Craig Hopkins

"3rd Grade Male Rat" is an unnamed third grader in Miss Sweetwater's class.

He played the flute for the school band in "Elwood City Turns 100!".

He makes regular appearances in many episodes. He appears to get along with other kids. His only line occurs while he is walking past Buster, Arthur, and Binky in the episode "Buster's Growing Grudge".

Physical appearance
3rd Grade Male Rat is a rat with an olive green complexion. He has whiskers and a little hair. He wears a blue-and-white striped pullover and brown pants with blue sneakers. His backpack is green. In the episode Germophobia he wore light blue swim trunks.

Personality
In Buster's Growing Grudge, he was shown walking up the steps mumbling, "Oh, Dear. Oh Dear." He may have been having a bad day or an overall nervous and pessimistic personality. Not much is known about him, but he appears to be nice and friendly to the other kids.

Friends

 * Muffy Crosswire: She invited him to her spring party.
 * 3rd Grade Male Cat: Seen walking out of the movie theater together in The Agent of Change.

Appearances
Specials
 * Specials
 * Arthur - It's Only Rock 'n' Roll
 * Season 1
 * Arthur's Eyes 10101
 * Arthur and the Real Mr. Ratburn 10201
 * Arthur Goes to Camp 10701
 * Francine Frensky, Superstar 11002
 * Arthur's Lost Dog 11202
 * Arthur, World's Greatest Gleeper 11702
 * Arthur's Substitute Teacher Trouble 12702
 * The Scare-Your-Pants-Off Club 12802
 * My Club Rules 12901
 * Season 2
 * Arthur's Lucky Pencil 20202
 * Buster and the Daredevils 20302
 * Buster Baxter, Cat Saver 20601
 * Arthur's TV-Free Week 20701
 * Arthur vs. the Piano 20801
 * Arthur's Mystery Envelope 21002
 * Buster Hits the Books 21102
 * Arthur and the Square Dance 21202
 * Water and the Brain 21301
 * Love Notes for Muffy 21601
 * D.W. Blows the Whistle 21602
 * Season 3
 * The Ballad of Buster Baxter 30102
 * Revenge of the Chip 30502
 * Meet Binky 30602
 * Arthur Rides the Bandwagon 30701
 * Dad's Dessert Dilemma 30702
 * Buster's Growing Grudge 30802
 * Arthur's Almost Live Not Real Music Festival 31102
 * What Scared Sue Ellen? 31201
 * Arthur's Dummy Disaster 31301
 * Arthur and D.W. Clean Up 31501
 * The Long, Dull Winter 31502
 * Season 4
 * Arthur's Big Hit 40102
 * Muffy's New Best Friend 40202
 * The Fright Stuff 40302
 * Binky Barnes, Wingman 40701
 * To Beat or Not to Beat 40702
 * That's a Baby Show! 41002
 * Season 5
 * Double Dare 50102
 * Kids are from Earth, Parents are from Pluto 50201
 * It's a No-Brainer 50301
 * The Shore Thing 50302
 * The Lousy Week 50501
 * The Election 50601
 * Season 7
 * Muffy Goes Metropolitan 70202
 * Elwood City Turns 100! 705
 * Jenna's Bedtime Blues 70602
 * Season 8
 * Bitzi's Break-up 80102
 * Vomitrocious 80501
 * Season 9
 * Francine's Big Top Trouble 90201
 * George Blows His Top 90202
 * The Law of the Jungle Gym 90302
 * Binky Goes Nuts 91001
 * Season 10
 * Desert Island Dish 100301
 * Do You Speak George? 100901
 * What's Cooking? 101001
 * Season 11
 * Germophobia 110102
 * Phony Fern 110401
 * Francine's Pilfered Paper 110801
 * Buster Gets Real 110802
 * Season 12
 * The Cherry Tree
 * Season 13
 * The Great MacGrady 1301
 * The Silent Treatment 130201
 * Season 14
 * The Agent of Change 140201
 * Season 15
 * Buster's Secret Admirer 150301
 * To Eat or Not to Eat 150501
 * Season 16
 * Brain's Biggest Blunder
 * Season 20
 * Cereal 200202
 * The Hallway Minotaur
 * Arthur and the Haunted Tree House

Trivia

 * According to "Sue Ellen Moves In", Buster thinks he is an alien.
 * In "Francine's Big Top Trouble", Arthur imagines D.W. being respected by everyone because she is his little sister. 3rd Grade Male Rat was shown cheering D.W. on in front of Lakewood Elementary School with other students.
 * He may have some sort of food allergy or restriction as he was seen at the special foods table in "Binky Goes Nuts". However, he may have just been sitting with a friend.