Every year, thousands of migrants face kidnap, rape and murder in Mexico. Driven by grinding poverty and insecurity back home, they travel through Mexico in hope of reaching the USA with its promise of a better life. But all too often their dreams are turned to nightmares.Told over four parts, The Invisibles exposes the truth behind one of the most dangerous journeys in the world and reveals the untold stories of the people who make the journey north through Mexico.Part One – SeaworldAt the start of their journey, migrants are filled with hope at reaching the USA. Among them is a young girl travelling with her family who dreams of visiting Seaworld. Filmed at a migrant shelter in southern Mexico, this film reveals the dangers that await them. Part Two – Six out of tenGael García Bernal talks to three women from Honduras who are travelling in search of a better life for their families. They are taking a huge risk. Six out of 10 women who attempt the journey are sexually abused. Part Three – What remainsRelatives in Central America may never know what happened to their loved ones. In El Salvador, a mother tells of her desperation at not knowing where her son is, a decade after he left for the USA saying he’d call home in 12 days. Part Four – ‘GOAL!’Despite the danger and the risks, the migrants will keep coming. They sleep rough, beg for food and grab lifts by clinging to the outside of moving freight trains. Many are seriously injured, but there will always be those prepared to brave the journey.