Primarily set in Barcelona, the plot follows the life of CNT secretary general and imposter Enric Marco, who built himself a fake past as a Nazi concentration camp survivor, gaining public recognition and sympathy.

[3][4] The screenplay was written by Aitor Arregi, Jon Garaño, Jorge Gil, and Jose Mari Goenaga.

[9] Shooting locations included the Basque Country (Zarautz), Catalonia, Madrid, and Germany.

[10][8] Marco had its world premiere in the Orizzonti section of the 81st Venice International Film Festival on 30 August 2024.

[4] Marta Balaga of Cineuropa declared Marco to potentially be "one of the most watchable films at the Venice Film Festival this year" [being] "dynamic, twisted and blessed with the kind of performance by Eduard Fernández that should get him all the awards out there".