Scotland-born Karen Gillan went from unknown to international TV star when she was plucked from obscurity to play the role of the Doctor’s companion in the latest two series of Doctor Who. Her role of Amy Pond coincided with a new Doctor (Matt Smith) and a new head writer for the program (Steven Moffat), and over the course of two seasons, she’s gone from a flighty barely grown girl, to a more grounded wife, who learned some shocking news in the show’s most recent episode. With Doctor Who returning for the second half of its latest series on Saturday, August 27, at 9 p.m. EST on BBC America, Gillan talked to The A.V. Club about the brilliance of Moffat’s scripts, traveling the world to promote the show, and her secret-keeping skills. The interview contains spoilers for major reveals from the last batch of episodes.