Doctor Who Has Fans Worried About One Companion

To backpedal just a bit, in case some Doctor Who fans may have forgotten: Graham met Ryan's grandma because she was a chemo nurse when he was undergoing treatment for cancer. The two formed a relationship, and when Graham's cancer had entered remission, they were married, making him Ryan's step-grandfather. Ryan and Graham haven't gotten along so well, although they've obviously bonded some, thanks to the adventures with the Doctor and their shared grief over the grandmother's recent passing.