[3] After necromancer Ashran seizes power in Idhún, enforcing his reign of terror through an army of flying snakes, the first battle for the land's freedom will take place on the Earth, where impulsive teenager Jack and aspiring wizard Victoria will face dangerous assassin Kirtash, sent by Ashran to Earth to destroy the Idhunites who fled his tyranny.

The series was first announced back in February 2019 by Netflix[5] and was originally set to have 10 episodes in its first season.

[6] Author Laura Gallego stated that it would cover the entire first volume La Resistencia (The Resistance).

[6] Laura Gallego, the writer of the books the series is based on, who also contributed in the show's development, wrote a short statement on her personal website objecting to the substitution of previously cast professional (spanish) voice actors by more popular actors who, save for Michelle Jenner, generally lacked experience in dubbing.

[10] Pere Solà Gimferrer of La Vanguardia stated that the first episode was "a disaster on every level, especially narrative", and cited as an example how the murder of Jack's parents at the beginning is recounted later on "with the same drama as if Jack had forgotten his keys or cut himself with a piece of paper while doing his homework.