The Head

Winter has fallen on the South Pole. A small team, known as the Winterers, will remain at the Polaris VI Antarctic Research Station to continue their innovative research, a crucial part in the fight against climate change. After the winter, Johan Berg returns to base, finding most of the team dead or missing. Only Maggie remained at the station.

As Maggie begins to recount details of how the members of the team were killed, the search team discovers a frozen hand peeking out from the snow near the base.

Jolted by the revelation of Sarahs death, Maggie reveals that the killer was looking for something which Maggie found and kept with her.

Far from land, Arthur Wilde and his team of scientists celebrate the culmination of decades of research: a solution to climate change. Then, a gruesome murder – eerily similar to Wilde’s South Pole nightmare – occurs onboard.

With Charlie locked up, Amy brings lingering doubts to Wilde, confirming his greatest fears. In the U.K., Olivia and her sister are attacked while plotting their revenge.

After another scientist turns up dead, the mole reveals their true identity – and asks for a favor in return.

In Bir Tawil, a lawless territory in the middle of the desert, Rachel, Maggie and a new group of scientists test bacteria from their research on humans for the next phase of the trial. But after an uninvited visitor and an unexpected death, Maggie and Rachel fear their worst nightmare is happening all over again.

Bases supplies are sabotaged. At Portlaoise, Arthur gets a letter from a secret admirer "XX". Distrust mounts over the tampering.

After a forceful shift in power, both scientists and subjects do whatever it takes to stay alive -- even if it means turning on one another. Following a jarring discovery, the remaining subjects attempt to escape the facility, while, at Portlaoise, Arthur receives an unexpected visitor.