"Doug's Marriage Madness" is the 65th and final episode from the Disney version of Doug.
More changes in Doug's life are underway as Judy prepares to leave for college and Doug's voice begins to crack. Seventh grade is over for Doug and his friends, and to start off the summer, Chad and Ms. Krystal are getting married. Principal White is performing the ceremony and Patti is to carry the wedding ring and asks Doug to hang onto it for her since her dress has no pockets, but while paying for frothy goats he accidentally loses it. Convinced he gave the ring to Mr. Swirly, Doug and Skeeter ride all over town to try to find him and the ring before the wedding starts. Meanwhile at the church, Mr. Bone and Mr. Fort argue over who should get to play at the wedding, Judy complains the stage she is performing on is too small, and one of Mr. Dink's very expensive machines goes crazy. If that wasn't enough, Roger's wedding present lands on top of the reception tent causing the tent to collapse, and Principal White faints as soon as the wedding starts, causing everyone to start arguing again. But Doug saves the day by stepping up and telling everyone that they need to support Patti, Chad, and Ms. Krystal, so everyone helps perform the ceremony. After Chad and Ms. Krystal are married, Judy drives away towards Vole, the Sleech twins get dates, Cleopatra says her first word, and Patti (now Ms. Krystal's stepdaughter) asks Doug on a date to the upcoming Summer Harvest Moon Festival. Doug reaches the last page of his journal, Porkchop gives him a new one, and Doug ends the episode, let alone the series, by saying "So long, everybody. It's been fun. Your friend forever, Doug".
- This marks the last time the Doug characters have appeared in animation.