The second series of The Sarah Jane Adventures will see Sarah and adopted son Luke travelling back to the 1950s...

(Highlihjt spolier) ...and encountering a baby Sarah Jane!

Foxglove Village Church Fete is the setting in the two parter (likely 9 and 10, indicating the concluding story of the series) and there's certainly some unusual stuff in store, judging by what I've read so far. I suggest to find out more, you right-click and drag your cursor over the white area below, as well as the bit after the elipses above...

(Highlight spoiler)

Sarah and Luke somehow find themselves thrown back 50 years and meeting Sarah's parents.It seems that Sarah Jane doesn't remember her parents owing to their premature deaths while she was a baby, leading to some interesting moral choices...