The most expensive and specialized airplane ever built, the B2 Stealth bomber carries a price tag of more than two billion dollars. Highly effective and extremely technically advanced, it has been an integral part of the Air Force arsenal for the past 20 years. From a Cold War scrap heap candidate, to the go-to bomber in the 2011 strike against Qaddafi's army in Libya, "Spirit" has seen its share of trials and triumphs. Join us as we detail how this secret weapon evolved to overcome critics, espionage, and even tragedy, to change the shape of aviation forever.

• Documentary