Dr. Thomas Asbridge explains how in the thirteenth century, after almost two hundred years of Holy Wars, the titanic conflict between Christianity and Islam, known to history as The Crusades, reached a decisive and shocking conclusion – a chapter that despite its drama has been virtually forgotten. He explains how, in the end, the fate of the Holy Land was decided not on the hallowed ground of Jerusalem, but in Egypt; and how the ultimate outcome of the Crusades was dictated not by Christians, but by the Mongol successors to Genghis Khan, and by a Muslim slave – a fearsome warrior whose story is now all but lost to western history.

Everyone has an opinion on bad cars. Now it's time to hear the ones that really count - ours. We're out to name and shame the most rubbish car from a manufacturer which, frankly, should have known better. And we have a special, surprise fate in store for the car we pick as our biggest loser. In this Top Gear special episode, Jeremy Clarkson and James May try to look for the worst car of all time and the criteria was that the car had to be 'terrible, but not cheap' and made by 'a manufacturer that should have known better'.

For more than 80 years, Solenopsis Invicta has been on a ceaseless march across the United States, racking up six billion dollars every year in crop damage, equipment repair, and pest control. They have conquered more than 320 million acres in 13 states and killed at least 80 people. And the invader is still on the move. Globally. Now, scientists are cracking the ant's ancient secrets to success and breeding winged assassins to hunt them down. Stunning 3D macro photography explores the secret world of the fire ant and the cutting-edge research into stopping it

It's a natural history epic. It's a compelling detective story. It's a scientific adventure at its best. It took Dr Fred Urquhart almost 40 years to discover the monarch butterflies' secret hideaway and prove the most incredible migration on Earth. Following the year-long annual migration cycle of the butterflies, the award-winning production team filmed hundreds of millions of monarchs in their remote overwintering sanctuaries in Mexico in 2011 and again in 2012 and also along their migratory routes from Canada, across the U.S. and into Mexico. The film immerses you in the astounding migration experience as two generations of the butterflies migrate north and then a Super Generation miraculously finds its way from Canada to a few isolated mountaintops in Mexico.

Fly across iridescent tropical reefs, brush through a cloud of a million jellyfish, visit an alien world where the closer you look, the more you see, where the tiniest creatures support the greatest predators... We think of reefs as exotic, distant places with little or no connection to our everyday world. Yet every reef is a living city beneath the sea with a parallel existence to ours, distant yet undeniably connected. Reefs are hotspots of biodiversity as vital to life on earth as the rain-forests. They have been shaping our shorelines, literally forming islands and mountains, for millions of years. The fossil record shows that given time they have recovered from all of earth's major extinction events. Even reefs pulverised by atomic blasts at Bikini Atoll have regenerated. Yet within our lifetime reefs have come to face their greatest threat...

Hollywood actor Jason Scott Lee has been a student of Bruce Lee's martial art Jeet Kune Do for 20 years and in Secrets Of Shaolin. He fulfils his lifelong dream of joining the institution that invented kung fu - Shaolin Temple. In an intense two-week kung fu bootcamp, Jason will not only discover Shaolin's centuries old secrets of turning the human body into the ultimate weapon, but also experience the spiritual effects of it's Zen Buddhist practices. Secrets of Shaolin promises to be a stunning, action-packed insight into the world's most famous martial art and a spectacular celebration of the place, people and culture that has inspired generations of fans.