The PBS Kids show aired the episode, titled “Mr. Ratburn and the Special Someone” and starring lesbian actor Jane Lynch as a special guest. As TVLine reported, the plot revolved around Arthur and the gang finding out their teacher Mr. Ratburn was planning a wedding. When they see him having lunch with an uptight woman who tells him to “toughen up,” the kids believe their teacher is making a mistake in getting married and try not to let him do it. n a plot twist, the woman Mr. Ratburn was having lunch with turns out to be his sister—played by Lynch. Mr. Ratburn is instead marrying a man. The gang looks reassured that the couple is happy and proceeds to enjoy the wedding cake, appropriately topped by two grooms. The reveal surprised and delighted viewers in equal measure. Several people reacted to the news on social media, with “Arthur” trending on Twitter.