Horizon uncovers the secret world of our dreams. In a series of cutting-edge experiments and personal stories, we go in search of the science behind this most enduring mystery and ask: where do dreams come from? Do they have meaning? And ultimately, why do we dream? What the film reveals is that much of what we thought we knew no longer stands true. Dreams are not simply wild imaginings but play a significant part in all our lives as they have an impact on our memories, the ability to learn, and our mental health. Most surprisingly, we find nightmares, too, are beneficial and may even explain the survival of our species.

After returning from Afghanistan with severe depression and PTSD, Harry Turner went to the Peruvian Amazon to end his life. There, he met conservationist and scientist Samantha Zwicker, and through their work together raising orphaned wildlife he is finding a reason to live.
'Wildcat' takes viewers to the remote Las Piedras River to witness how two orphaned ocelots and the solitude of the rainforest help a young man and young woman with traumatic pasts. This feature-length documentary is an intimate, character-driven story about the impact of wild places on us - and our impact on them.