In the first episode something makes every child on Earth suddenly freeze and not move.
It's aliens of course.
Torchwood has to find a way to stop both the alien threat and a British government who is working against them.
There are some funny moments, most notably Ianto and the SUV, but the final two episodes
Oh and COE was designed for people who have never seen TW before, as well as regular viewers so it shouldn't matter than you haven't seen TW since season one, but you might be confused at the abscence (sp?) of certain characters.