Has your heart stopped beating yet? Do you need a minute still?

Castle aired a pulse-pounding episode last night, introducing viewers to CIA Agent Sophia Turner (Jennifer Beals), along with a worldwide conspiracy. And the best part? It was only the opening hour?

Indeed, "Pandora" will conclude next Monday evening with "Linchpin," an outing that will find our favorite duo racing to prevent the first domino from collapsing in a chain of events that would lead to nation into war. Get your first look at the installment now and prepare to hold on...

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.