Actually that't not quite true as Dory isn't lost this time around but she has mislaid something - her family. That's the big drama for this new entry in the series as she undertakes a journey to find herself and her home in typically emotional Pixar fashion.
You can see the not so successful beginnings of that journey in this new clip.
Dory (Ellen Degeneres) has a point - Marlin (Albert Brooks) had no problem leaving the reef when it was time to find his son, so we're assuming he eventually comes around to the idea.
There are new cast members including Diane Keaton, Eugene Levy, Ed O'Neill and Idris Elba and the original voice of Nemo Alexander Gould will have a cameo. Presumably he sounds like a grown up now after 13 years have passed. Gosh that's a long time.
Andrew Stanton directs and this is going to be absolutely huge. The film is in cinemas in America next week but we'll have to wait until the end of July 2016 in Ireland.