Wherever they appear, orcas are the rulers of the seas. These majestic marine mammals have captured people's hearts and inspire awe with their intelligence and complex family structures. But since orcas began attacking boats off Gibraltar, many have been asking themselves: are they a threat to us, or do they just want to play?

In this lavishly produced nature documentary, marine biologist and wildlife filmmaker Florian Graner gets to the bottom of the mystery of orcas. What makes the largest members of the dolphin family so successful?

Singer and orca enthusiast Sarah Connor lends her voice to the documentary, giving the stories of the orcas a special depth.