Mass Effect 3 "Ruthless and Intelligent Enemies" Trailer

The towering, unstoppable engines of destruction known as the Reapers pose the greatest-ever threat to the galaxy – and to your own survival. They bring with them a host of abominations – various races from across the galaxy, perverted into horrific servants of war. And the threat doesn't end there. Also standing in your way is a wide variety of malevolent forces, including the well-equipped pro-human group Cerberus, and the Geth, formidable alien adversaries with their own hidden agenda.