Doctor Who returns to BBC One in the UK later this month and to BBC America in the fall. The trailer below is a first look at the episodes leading up to the departure of series regulars Karen Gillan and Arthur Darvill. Matt Smith, the current Who, faces off with more Daleks than ever before and dinosaurs “On a spaceship!” Alex Kingston will return as River Song with Rupert Graves and Diana Rigg guest starring this season. Jenna-Louise Coleman joins the cast during the Christmas special. Season 6 of Doctor Who was the most watched series ever on BBC America and the most downloaded on iTunes in the US, according to the BBC.