I went to it in the Guide and pressed info - then went to other showing it on a 9 pm & then 11 Pm - It titled as documentary - I don't think it's a Series (And I could be wrong) but the guide is not showing it as one/ Now is the guide correct? but it's not on again in the next 14 days.
I suggest you go to the Discovery web site and contact (email) them direct and see whats/whats.
That best I got for you