I need to start this review by saying that "The Incredibles" remains my favourite superhero movie ever, and one of my favourite movies period. Which means that this one had a lot to live up to.
The film starts exactly where the previous one left off - with the family in pursuit of "The Underminer" who appeared at the end of "The Incredibles." This doesn't go particularly well, and gets superheroes as a whole in more trouble again. But Elastigirl (aka Mrs. Incredible, voiced by Holly Hunter) is recruited by eccentric billionaire Winston Deavor (Bob Odenkirk) to work toward legitimizing superheroes again - in the process leaving Mr. Incredible (Craig T. Nelson) to take care of the kids, a thing he's never really done before. And which is made more difficult by the rapid emergence of their baby's multiple powers. Things get worse for Elastigirl and eventually a new supervillain called Screenslaver surfaces.
Bird and crew deliberately (per the extras) alternate between the mundane and the "super," a formula that worked exceptionally well in the previous movie. A lot of thought went into the movie, and there were some great jokes. I didn't think it was the equal of the previous one, but I don't think anything could have been - and they did succeed in making something that did credit to its predecessor.