SERIES PREMIERE: Dates really surprised me. From the title, and the network, I expected a reality show full of beautiful young twentysomethings. Instead, this series turns out to be much more mature, challenging, and original. In fact, it’s not a CW original at all, but a British import – of an anthology drama series from 2013. Two episodes are shown each Thursday this summer on CW, beginning with the first date between David and Mia (Will Mellor and, from Game of Thrones, Oona Chapl