The Dungeons & Dragons cartoon from the '80s ended without a conclusion, as the show was canceled before the running storyline of the kids being trapped in a fantasy world was resolved. The final episode of Dungeons & Dragons was broadcast in 1985 and the kids have been stuck since then... or at least they were until a few days ago when a car commercial offered a conclusive ending to the series.
The Dungeons & Dragons cartoon is mostly forgotten in North America in comparison to other cartoons from the era, such as He-Man, but Dungeons & Dragons still has a dedicated fanbase in Brasil. Renault has spent a lot of money on a commercial for their KWID Outsider car which remade the classic cartoon and actually ended the series, albeit in an unconventional way.
The KWID Outsider commercial shows the kids escaping from Tiamat and Venger with the aid of Dungeon Master, who shows up in the car and lets them use it to drive away. Presto (the bumbling wizard of the group) casts a spell on the Sat-Nav which opens a portal that sends them home. If the commercial is considered to be canon, then it ended the Dungeons & Dragons cartoon, as the kids made it home. It only took them thirty-four years and required the help of a magic automobile, but they finally did it.
There used to be an urban legend concerning the ending of the Dungeons & Dragons cartoon that was spread online, which stated that the planned final episode would reveal that all of the kids died in the theme park from the first episode and that Dungeon Master was secretly the Devil. The urban legend has since been refuted over at Comic Book Resources, but there was another episode that never made it into production called "Requiem" which would have had a cliffhanger ending. These two endings have since been overwritten by a car commercial of all things.
The production values of the KWID Outsider commercial are outstanding and it really feels as if the show would be easy to remake using modern effects technology (except without the car). There is a new Dungeons & Dragons movie in development, but this commercial might earn enough attention to prompt a revival of the cartoon series.