Having watched the series a while back, it makes me curious as to how each episode is planned etc; well it is perfect timing that The Gutters have come up with the answer.
Sure, this is related to writing a comic series, but the basic flow is bound to be the same. Check out the story board to see how it is done, it seems that they you only have to fill in the blanks to create a good story!
Surely, it is not that easy, is it!
Source [Nerd Approved]