Where it all began.
The first episode/part was amazing great introduction to the Doctor, Susan and sets up the show well.
The rest of the episodes are pretty decent, but they are acted, edited and shot good.
The plot of the last three episodes are alright, and give audiences a good start point even they are slightly uninteresting in places.
The first episode was written, directed, shot and edited beautifully. Just the whole serial fell a tad short that's why I give it this rating.