The Dungeons & Dragons cartoon from 1983 ran for three seasons on CBS before being cancelled, with our teen-aged adventurers never getting home. It was successful enough that it lead its time slot for two years. Of course, it was not without controversy--particularly one episode where the characters considered killing their nemesis Venger. In 1985, the National Coalition on Television Violence called the cartoon the most violent show on TV.
It begins with our six heroes getting into a roller coaster ride at a theme park and are magically transported to the world of Dungeons & Dragons, where they meet the Dungeon Master, who gives them their powers and outfits to help them survive the Realm. Though the Dungeon Master is their mentor while they are there, he also seems to be manipulating them as well to do what he wants them to do. They also encounter Uni the baby Unicorn there, as well as Venger--the show's main antigonist. The teens try to make their way home over the course of 27 episodes, though it's not as easy as they thought it would be as they try to help the people they meet along the way.
You can buy Dungeons & Dragons on DVD--there is a five-disk package that contains a lot of extra features including a radio-type program of the final, unaired episode; or you can wait until August 25 and buy the bare-boned 3-disk compilation that won't have the extra features.