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List of Arthur seasons
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Season 21 of Arthur premiered on PBS on Tuesday, October 24, 2017, with "Binky's 'A' Game/Brain and the Time Capsule"[1] and "The Master Builders".[2] Certain stations kicked it off Monday, October 23, with Arthur and the Haunted Tree House, but others did not consider it part of the regular TV season. It concluded on February 15, 2018, with "Invasion of the Soccer Fans/Pal and the Big Itch".[3]

Production began on September 9, 2015.[4] This is the second season where the animation is entirely done by Oasis Animation, though it was produced at the same time as Season 20. Together with Season 20, there are 14 new 30-minute episodes. There are also two one-hour specials that are not considered part of either season, though "Arthur and the Haunted Treehouse" premiered alongside new episodes of Season 21.[5]


Picture Title Number Episode Original Airdate
Binky's 'A' Game main image.png "Binky's 'A' Game"[6] 233 1a October 24, 2017[1]
When Binky gets an "A" on a test, Muffy and Francine are convinced he cheated. Is it possible that he actually studied?
Brain and the Time Capsule main image.png "Brain and the Time Capsule"[6] 233 1b October 24, 2017[1]
Alan makes a time capsule and gets overwhelmed by people asking to have their special belongings included. Will he make room for them or give them the boot?
The Master Builders main image.png "The Master Builders"[2] 234 2 October 24, 2017[7]
Buster struggles to build a birdhouse that will save the community garden from pests, while Muffy and Francine design a cat toy that they think will really change the pet toy game.
Francine and the Soccer Spy main image.png "Francine & the Soccer Spy"[8] 235 3a October 26, 2017[9]
When Ladonna befriends a new member of the Mighty Mountain Elementary Soccer Team, Francine becomes convinced she is leaking top secret team info.
Last Page.png "Sue Ellen & the Last Page"[8] 235 3b October 26, 2017[9]
The City Council has voted to close the library! Can Sue Ellen save it before it's too late?
Muffy Misses Out main image.png "Muffy Misses Out"[10] 236 4a February 12, 2018[11]
Muffy worries that her friends don't need her anymore when they plan a bake sale without her.[10]
Atas.png "Arthur Takes a Stand"[10] 236 4b February 12, 2018[11]
Arthur thinks Mrs. MacGrady is being treated unfairly and seeks guidance from Congressman John Lewis.[10]
Sst.png "Slink's Special Talent"[12] 237 5a February 13, 2018[13]
When Rattles takes over Slink's paper route, Slink is determined to prove himself and earn it back.
2105btakeahikemolly.png "Take a Hike, Molly"[12] 237 5b February 13, 2018[13]
When the Tough Customers go on a hike in the woods, Molly makes a few mistakes and has to apologize...but she refuses to!
The Lost Dinosaur main image.png "The Lost Dinosaur"[14] 238 6a February 14, 2018[15]
It's pretty hard to lose a dinosaur...but Rapty is missing! Can Bud be brave without his imaginary friend?
The Princess Problem main image.png "The Princess Problem"[14] 238 6b February 14, 2018[15]
D.W. loves the Princess Platoon series until she realizes that it doesn't represent everyone. With the help of Arthur's friend, Lydia, she discovers the true qualities of a princess.
Invasion of the Soccer Fans main image.png "Invasion of the Soccer Fans"[16] 239 7a February 15, 2018[3]
Kate appears to be hypnotized by the soccer game on the television! Can Pal, Amigo, and Killer snap her out of her TV trance?
Screen Shot 2018-01-11 at 8.34.22 AM 1.png "Pal and the Big Itch"[16] 239 7b February 15, 2018[3]
When Pal has to wear a cone, he takes advantage of his friends' special treatment...and the decision comes back to bite him.