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.

Brazzaville, Republic of Congo - 1 year after it happened

Topi flees a young African soldier following him - only to find an unlikely ally.

Oria, Italy - 3 months before it happened

Matteo, in priestly robes, faints as he meets Simona in his church - when he wakes he blames it on his body adapting to his new H+. In the pew, he tries to make a personal connection with Simona, who confesses to visions past and future.

Northern California, USA - 2 weeks after it happened

As Francesca and Simona reconnect in the cabin, Kenneth preps Anthony for what to do while he's gone: he's planning a dangerous journey with a critical goal.

Dublin, Ireland - 3 years before it happened

After skipping his own party, Breanna seeks out Kenneth at his apartment. Kenneth reveals why he's been on edge.

MUMBAI, INDIA - 7 MONTHS AFTER IT HAPPENED

Gurveer tries to convince his superior of an important next step with the child.

LONDON, UK - 9 YEARS BEFORE IT HAPPENED

In an underground medical experiment, a figure presses a nervous Gurveer to bring his new implanted chip to full power on an unlikely test subject.

Dunbara, Republic of Congo - 1 year after it happened

Topi and the young soldier search for Dunbara - a village burned to the ground long ago. They find the area and dig; Topi knows what he is looking for...

Northern California, USA - 3 years before it happened

Jason and his fringe political clan of neo-Luddites have raised the stakes and kidnapped an enemy to their cause...and let him know what they want from him.

Mumbai, India - 8 months after it happened

In the post-disaster India, Gurveer visits Leena's small village with one goal in mind, and encounters a reaction he doesn't expect.

Northern California, USA - 3 years before it happened

Kenneth has a dream and wakes with an insight that drives him to alert someone immediately.

Southern Alberta, Canada - 8 months after it happened

Working with Simona, Kenneth struggles to set up a familiar network.

New York, USA - 8 years before it happened

Jason wants a fair settlement for the harm caused him by LPW, a biotech firm. The LPW lawyer interprets things differently.

Rome, Italy - 2 years after it happened

Topi reaches the base and finds a clue: a message from Manta meant only for him.

Dunbara, Republic of Congo - 7 years before it happened

Peters and Gurveer negotiate with a remote African chief, promising, "When you see what it can do for you and your tribe, you'll realize money is nothing in comparison."

Rome, Italy - 2 years after it happened

Manta, having hallucinations, reaches out to Matteo for help. She says she doesn't need him to be a priest, but wants him to listen to her confession.

Oria, Italy - 3 months before it happened

Concealing his H+ connection from Jason and the neo-Luddites, Kenneth forms a plan a continent away.

Yozgat, Turkey - 1 year after it happened

Riding with Gurveer and baby Vadish in the back seat, Leena connects with Connal for the first time in a year...and reaches an unsettling discovery.

Northern California, USA - 2 weeks before it happened

While rallying his troops, Jason's mechanical body brace gives out and he is unable to move his arms and legs. He turns to someone he considers a trusted friend for help.

Southern Alaska, USA - 1 year after it happened

Kenneth, Simona and Francesca reach the Alaska Data Center, but there is a surprise waiting for them there.

Hamburg, Germany - 3 years before it happened

Topi chases Manta into a German subway station desperate to have her hear his one plea.

The Vatican, Italy - 2 years after it happened

Topi crashes into where Gurveer is hiding with Vadish...he carries a desperately sick Manta. Gurveer knows what is causing Manta such pain.

Our world - when it happened

At the data center, Kenneth has something else up his sleeve for Jason. In a flashback to the moment of the massive virus attack, we find clues to the deeper cause.