The first episode was a presentation of the characters, "Deep Throat" is the real beginning of the series'main plot. Everything is there. The government conspiracy, the aliens' technology , some people want to help Mulder in his quest, others betray him... This a great episode and it will be the base for the rest of the show. Chris Carter has found the right tone for the show after a first episode where they were looking for the best way to tell their stories. This one has it all. I strongly recommend it to anyone who starts watching The X Files because it's necessary to understand the rest of the show and, also it's very a good episode even more than ten years later.