Ancient Sumerian and Mayan prophecies state that after 2012 an alien race will come to invade Earth. ACIO is a secret agency whose founder Fifteen has dedicated his entire life to developing a time travel technology with which he wants to travel back to the past to save the Earth from an alien invasion. 2016, Sarajevo, Bosnia-Herzegovina: five mysterious ancient pyramids and an underground labyrinth of tunnels with stones and megaliths that emanate ultrasound frequencies have been discovered near Sarajevo. The tunnels are rumored to have a healing effect on people. Mirsad and Manda are a seventeen-year-old couple in love. When Mirsad's mother falls ill unexpectedly, they decide to visit the tunnels in a search for an alternative cure. While in the tunnels, the couple discovers a secret chamber with symbols on the walls that correspond to a drawing of an ancient tattoo Manda has on her arm. Their presence activates an interstellar gateway that sends Mirsad and Manda to a future world. 2028, Bearford Falls, United States of America: to prevent the alien invasion, ACIO has instructed the governments to nuke ancient sites across the planet which hold interstellar gateways. The scientists have begun genetically engineering a new race that will be resilient to radioactivity and thus continue the evolution: Homo hibrida, a cross-breed of humans and animals. But Fifteen has made one crucial mistake in his calculations: by nuking ancient sites, he didn't close the gates for the aliens coming to invade Earth - he opened them. Now it's up to Mirsad and Manda to change the course of history.