I'm hoping next week's episode will be a pure "historical" episode, not a "history + added aliens" episode. Alabama in 1955 is interesting in itself, and - sadly - would have as many dangers for at least half the current Team Tardis as any alien invasion.

(I also hope they take the trouble to get the history *right*. One thing that really irks me about New Who is the liberties they take with history - being somewhat of a history buff!)