Re: Best Season-long Story arc
It ended up being unified as the script pencilled in for the season finale ran into problems, so the script editor had to write a replacement, and he built on stuff from earlier in the season. So no, it wssn't intended till late on, but the Bad Wolf arc developed by accident as well.
"Some days are better than others. They say that where I come from."
"Loudly, I imagine, on the day you left."
(Blake's 7 - Rumours of Death)