The nightmare begins is an excellent starter episode for a series. Most of the shows these days are stale, washed up trash and are all the same but invader zim stuck out from the crowd. The nightmare begins grabbed the attention of the masses and made invader zim into the great success that it is today. Personally it is one of my most favorite episodes of invader zim ever made though almost all of them are equally great. The reason it is so great is because it is the first episode excellent and most of the time first episodes kind of suck.