Also, the primary (or secondary) recurring adversary will make its appearance by the second story.
On Buffy the Vampire Slayer, we were introduced to magic and witches, which rose to prominence slowly over time. On Ultraman, the alien Baltan was introduced.
And on Doctor Who, he first encountered the Daleks.
Of all the monsters and foes, the Doctor has been defined in part by his enemies. The Joker to his Batman (who was introduced along with Catwoman in the second appearance of the character). They are a menace that, despite their simplistic appearance, have frightened children for decades.
How did a pepper pot with a toilet bowl plunger and egg whisk for arms manage to do that?
For this, I basically went through what are considered the best Dalek stories, among them: Power of the Daleks, Genesis of the Daleks, Dalek and Bad Wolf/The Parting of the Ways.
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