A whole lot of people watched (and have been continuing to watch) Hamilton since its Disney+ debut on Fourth of July weekend, and it's caused many of those people to go digging deeper into the larger Lin-Manuel Mirandaverse. If ever there was an origin story for such a thing, it's this Hulu original documentary about his time in a slightly-corny, very-loveable, and often-impressive freestyle hip-hop improv theater group. Some familiar faces from Hamilton show up and stick around, but the story is best when it focuses on the group's less-famous members, and stresses just how important the art of off-the-dome wordslinging is to who they are as people.