Usually we title these kinds of guides "everything you need to know about XYZ show." But HBO's Westworld isn't easily summed up or explained. A huge part of its appeal is that it's so enigmatic, dropping clues and teasing out mysteries as its story builds. To fully appreciate season two, it'd be best to watch season one first - preferably twice - but if time is an issue (or if you just need a season one refresher), here's a crash course.