As with just about everyone who meets him for the first time, Jemma's a little taken aback. By taken aback, it means she's staring rather gobsmacked at the very pretty that is Captain Jack Harkness.

Unfortunately, Jemma fails at these sorts of things. "Jemma Simmons. Have we met? That's not a line, I mean it could sound like a line, but you look familiar. That's not a line either. Why do I keep saying that?"