Telltale games have released episodic games based on quite a few properties now.
They're the one's who do Back to the Future, Jurassic Park, Sam & Max and so on.
The games tend to be point and click style adventures (think Day of the Tentacle, Monkey Island) and episodic means it's kind of like a T.V show, in that you get an hour (or however long) game that segues into the next (game) episode.
http://www.telltalegames.com/
