The premiere episode of Season 1 of "Eternaut" unfolds with a serene scene of three girls aboard a sailboat, their laughter mingling with the gentle rhythm of the waves. One among them, soon to embark on a new journey, prompts a bittersweet farewell celebration. Suddenly, the tranquil sky is marred by a neon-lit cloud, heralding an unexpected tempest. The girls scramble to secure the boat, yet amidst the chaos, tragedy strikes, claiming the lives of two.
Meanwhile, in the bustling city, three men are en route to a weekly card game at a friend's abode. Their journey is momentarily halted by a protest that fills the streets with chanting and banners. Taking a detour, they decide to indulge in some whisky while navigating through the commotion. Arriving at Tano's house, they are warmly embraced by his wife, Ana, and greeted by Lucas, who has beaten them there.
Tano's joy at seeing Ruso and Juan is tempered by his displeasure at Ruso's uninvited guest, Omar. Juan, ever the joker, offers to assist Ana with the trash, teasing Tano about his penchant for hoarding antiquated items like phone books and maps, unbeknownst to them, Ana is covertly disposing of these treasures.
As the night deepens, the men immerse themselves in an intense card game, their camaraderie evident in their playful banter. Omar, left to his own devices, explores the house and stumbles upon an intriguing mask. Juan quickly reminds him of Tano's aversion to having his belongings touched.
Just as the game reaches a climax, the whisky they ordered arrives, adding a touch of festivity to the evening. However, the serene atmosphere is shattered by strange, ominous noises, initially mistaken for rain. But as the sounds intensify, Ana urgently summons Tano. The men rush to the window, only to witness Vincente sprawled unconscious on the ground outside.
Tano, poised to rush out and investigate, is halted by Lucas, who spots something eerie in the air. Ana, sensing danger, firmly refuses to let Tano leave. Their unease deepens as a car slams into a parked vehicle with a thunderous crash. Desperate to reach their loved ones, the men try to call out, but to their horror, the phones remain eerily silent. Sensing the gravity of the situation, Tano switches to action mode, instructing Ana to ensure all windows are securely shuttered.
Meanwhile, the men strive to keep Ruso's anxiety at bay as his thoughts are consumed with worry for his family. Tano attempts to offer him comfort, yet Omar chastises him for fostering false aspirations in Ruso's heart. This leads to a heated dispute, amidst which Ruso, unnoticed, slips outside. He takes a few tentative steps before his strength deserts him, and he collapses in the icy streets. Tano, filled with guilt, lays the blame on Omar for Ruso's untimely demise.
Following this tragic loss, the remaining members remain confined within the shelter, each blaming themselves for the outcome. As the temperature drops, they hastily don heavy coats. Juan's mind wanders to his ex-wife, Elena, and his daughter, Clara, and his concerns deepen.
Suddenly, a knock echoes through the old garage door. A woman's voice, pleading for help, resonates from the other side. Tano, wary of opening to strangers, hesitates. But, after some persuasion from the others, he reluctantly unlocks the door to reveal the whiskey delivery girl. She explains that she was repairing her bike when a snowstorm descended upon her.
They usher her inside but maintain a wary stance, having expected a male delivery person. Juan seizes this opportunity to sneak into the garage office in hopes of locating the car keys. However, despite their efforts, the car remains dead. While exploring the garage, Tano observes an eerie phenomenon: the snow loses its color upon touching the ground.
Inside, Lucas and Ana question the delivery girl, Inga, who reveals she was aiding her brother. The group outside rejoins them, and they begin to devise a plan. Juan, desperate to check on his family, insists on leaving. Their conversation is interrupted by the sight of a still-living neighbor. They frantically try to warn him not to open his window, but it's to no avail. Witnessing the neighbor and his wife perish hardens Juan's resolve to save his loved ones.
Tano agrees to craft a suit for Juan and provide him with a mask. They work tirelessly, every stitch and fold a testament to their determination. Tano suggests Juan arm himself, but Omar, believing the mask was his idea, grabs the gun. Fortunately, Tano disarms Omar, uncocked and harmless, and warns him against any future actions that could jeopardize their safety.
Fully suited and armed, Juan prepares to depart. His journey is fraught with the sight of countless corpses, each a stark reminder of the world's perilous state.
