Frozen II is a unique movie in many ways. It’s in a class by itself as the highest grossing animated film ever made, but it’s also one of Walt Disney Animation’s few sequels. These things alone would make the film worthy of it’s own documentary series, but the new Disney+ series, Into the Unknown: Making Frozen 2, which debuted this past weekend, also shines a light on another way the film is special. It deals with some powerful emotional issues you don’t usually see in animated “family” movies, like depression. And it’s thanks to Kristen Bell that the movie did that.