Season 20

Season 20 of premiered on PBS on October 10, 2016  with "Buster's Second Chance/Arthur and the Whole Truth" and concluded on June 1, 2017 with "The Hallway Minotaur/Ladonna's Like List". It is the first to have only seven episodes.

Production
WGBH signed an agreement with Oasis Animation to animate both Season 20 and Season 21, instead of 9 Story Media Group. Production began on September 9, 2015. All work was completed as of December 2016. Together with Season 21, there is a total of fourteen 30-minute episodes. There are also two 1-hour specials that are not considered part of either season: Arthur: D.W. and the Beastly Birthday (May 29, 2017) and Arthur and the Haunted Tree House (October 23, 2017).

Christian Distefano is the new voice of D.W., replacing Andrew Dayton. Distefano also voiced James in Season 18. Jacob Ursomarzo replaces William Healy as Arthur. Jacob Ewaniuk and Jake Sim are replaced by Devan Cohen and Samuel Faraci as Timmy and Tommy Tibble.

For this season, the animation duties were handed to Toon Boom Animation after use of Adobe Flash.