SAN FRANCISCO, USA - 5 MINUTES BEFORE IT HAPPENED: we segue to a couple parking their car in an underground airport garage. The husband, Lee, surreptitiously watches a football game on his H+, upsetting his wife Julie who wants him to drive safely. Their domestic squabble is interrupted by a bizarre spectacle throwing their world into chaos.

SAN FRANCISCO, USA - 15 SECONDS AFTER IT HAPPENED: Julie and Lee stand shocked at the sudden chaos surrounding them in the lot and then risk a similar fate as Lee goes to aid the fallen people. A mysterious bearded man in glasses, Kenneth, appears and leads a small group down to Level 6, where he insists they're safe. But some in the group are skeptical of their hero and, namely, his theory for what has just happened.

HELSINKI, FINLAND - 7 YEARS BEFORE IT HAPPENED: a young man, Topi, enters a bar to meet a woman named Manta, who he has chatted with online. Manta plays mysterious, giving Topi a hard time, but Topi may have secrets of his own.

SAN FRANCISCO, USA - 1 MINUTE AFTER IT HAPPENED: with a small group from Level 6 of the parking structure, Kenneth takes Lee's body to a van to get out of the water from the sprinkler system with the hope he may be able to save him

MUMBAI, INDIA - 5 MONTHS BEFORE IT HAPPENED: Breanna, a hard-charging technology executive, and her husband Connal (both Irish) meet with a doctor, Gurveer, and a young woman, Leena (both Indian), to arrange a surrogate pregnancy. When the introductory meeting turns into something more like an interrogation and Breanna leaves to continue a work call on her H+, Connall tries to make a more human connection.

ORIA, ITALY - 2 YEARS AFTER IT HAPPENED: in a desolate village, Matteo tries to help a man injured in an accident, but realizes getting the medicine he needs will not be easy.

MUMBAI, INDIA - 5 MONTHS BEFORE IT HAPPENED: Gurveer prepares to implant H+ in Leena so the parents can track her pregnancy from abroad: she's anxious and asks many questions about the process. Gurveer, who tells her his own body is not compatible with H+, tells her she is lucky...though something else is commanding his attention.

SAN FRANCISCO, USA - 45 MINUTES AFTER IT HAPPENED: Kenneth races to save Lee's life with spare wiring and circuit boards, against the objections of Francesca, a soon to be a board-certified neurologist, who can't believe what she's seeing.

HELSINKI, FINLAND - 7 YEARS BEFORE IT HAPPENED: Topi, now in a physical relationship with Manta, goes to a crime scene which is technically out of his office's jurisdiction. His boss holds him back, but a look at the victim offers a tantalizing clue.

SAN FRANCISCO, USA - 50 MINUTES AFTER IT HAPPENED: Kenneth tells the small group to plan for a week below, and tries to stop an angry survivor from leaving, only to be accused of being a terrorist. Just as he needs good news, he's pulled away to examine Lee whose condition has changed.

HELSINKI, FINLAND - 7 YEARS BEFORE IT HAPPENED Topi and Manta hike, sharing a growing intimacy - but Manta won't reveal anything about a particular subject.

SAN FRANCISCO, USA - 20 HOURS AFTER IT HAPPENED In a quiet moment, Francesca asks to get the truth from Kenneth, how he knows so much about H+. Meanwhile in the airport above a group searches for Kenneth.

Porland, Oregon, USA - 5 years before it happened Breanna, after pitching her new software venture to a corporate boardroom, later privately meets with a younger, clean-shaven Kenneth to offer an opportunity.

San Vito, Italy - 2 years after it happened Someone with an interface observes Matteo outside the gates of a base. Later, Matteo returns home and has a flash of insight.

Mumbai, India - 3 months before it happened In a conference with Dr. Gruveer, Leena is asked to adjust her sleep schedule to match Breanna's work demands. Strangely, Gurveer's attention seems divided.

San Francisco, USA - 2 days after it happened Brian, a young boy, finds his mother in the parking structure and describes the chaotic world above, and Kenneth gives him a special assignment.

Helsinki, Finland - 7 years before it happened Drunk, Topi stumbles onto a fragment of a conversation online and is suddenly messaged by Manta, who he meets at their bar for a surprising exchange.

Oria, Italy - 2 years after it happened Matteo experiences a vision and is awoken from his trance by someone he has been close to but never met, standing in the rain

Mumbai, India - 1 month before it happened Through H+, Connal shows Leena more personal parts of his life - their connection grows deeper.

Oria, Italy - 2 years after it happened As Matteo gases up his car for a trip that will take a week, he prepares a young man to lead when he's gone...while making other preparations with his passenger.

Dublin, Ireland - 4 years before it happened Just before Kenneth leaves to visit the human trials of H+ in South America, Breanna feels there is something he needs to hear.

Southern Italy - 2 years after it happened Matteo and his passenger come to a roadblock with armed thugs. She makes a quick plan and gives Matteo explicit instructions.

Dublin, Ireland - 3 weeks before it happened As we see what Connal sees through his connection, Breanna grows suspicious of all the time he spends on his H+.

San Francisco, USA - 1 week after it happened Finally out of the parking structure, Kenneth needs to lead his people out of the reception area for H+ but Jason holds him at gunpoint. However Kenneth holds an advantage Jason wasn't counting on.

Tierra del Fuego, Chile - 4 years before it happened Kenneth visits the South American lab where the H+ technology is being synthesized onto the map of the human mind, and views the first test subject: someone we know well.