Barcelona, 2026. During Mobile World Congress week, Ulises Albet, a former tech prodigy turned anti-tech activist, becomes the prime suspect in a murder. As he escapes through a city under lockdown, he uncovers the imminent launch of a groundbreaking technology that could put humanity's ethical future at risk. To stop it, he must confront his past.

Day One poster

Day One (2026)

The future is offline. Your survival starts now.

★ 6.4/10 March 13, 2026 1 season

DramaMystery

Barcelona, 2026. During Mobile World Congress week, Ulises Albet, a former tech prodigy turned anti-tech activist, becomes the prime suspect in a murder. As he escapes through a city under lockdown, he uncovers the imminent launch of a groundbreaking technology that could put humanity's ethical future at risk. To stop it, he must confront his past.

Where to watch

Amazon Prime Video Amazon Prime Video Amazon Prime Video with Ads Amazon Prime Video with Ads

Trailer

Cast

Álex González Álex González Ulises Albet Asier Etxeandia Asier Etxeandia Samuel Barrera Alba Planas Alba Planas Rebeca Jordi Mollà Jordi Mollà Diskin Renata Notni Renata Notni Ivan Massagué Ivan Massagué Mireia Oriol Mireia Oriol Melina Matthews Melina Matthews Peter Vives Peter Vives Àgata Roca Àgata Roca David Selvas David Selvas Mercè Martínez Mercè Martínez Bet

User Reviews (1)

MovieGuys
MovieGuys March 22, 2026
★ 7/10

"Day One" does a few things moderately well but remains a rather formulaic sci-fi crime thriller. If you were expecting anything novel or thought-provoking, you won't find much on offer from this Spanish series. It's a very mild cautionary tale about the risks associated with AI and big tech, but this is, at its core, a crime thriller. Predictably there's the usual woke content and a warning about how social media needs policing, even, no doubt, if that means taking away people's right to privacy, as we are seeing in Australia. Acting in this series is solid; no complaints there, and it's well paced and rarely dull. In summary, a serviceable sci-fi thriller from Spain. Worth a look.