Is Dr. Who suitable for 7yr old and 4yyr old boys?

[Psycho]

I have been quite strict so far saying they are too young to watch it.
But they are desparate to watch this new series, and most of the boys in Ds1 class seem to watch it.

I am actually more worried about Ds1 watching it, than DS2, as he is the more sensitive/susceptible type.

What sgould I do?

I haven't really watched it myself, I just remember being scared myself as a child. How scary is it?

i think 4 is too young - most won't understand some/most of it and that might cause a few worries or weird dreams. Whats the rush? i guess older one wants to be in with his mates so it might be more peer pressure for him - maybe record one one night and show him another time if its ok - they vary a bit - some are scarier than others i reckon