In black and white, two men descend a set of stairs that lead to a number of doors. The younger of the men, a man called Julián, asks if the time machine is Spanish, and the older, Salvador, replies that it's ridiculous, because the time machine does not exist: what exist are the time doors. Wait, I've seen this before...
It's El Ministerio Del Tiempo, Televisión Española's newest series... in the year 1966! Starring our favorite characters, Julián Martínez, Amelia Folch and Alonso de Entrerríos! Salvador and Ernesto, who were the ones watching the scene, are left shocked by this blatant attempt to destroy the Masquerade (not to mention their sudden intrincate knowledge of the Ministry agents), and Ernesto immediately calls the patrol. After a series of Actor Allusion references, Salvador hands them their mission: they must go to 1966, find out who not only is trying to reveal the secret of the Ministry and prevent the series from coming out to light. While Alonso and Pacino infiltrate as extras for the series, Lola will become Television Española's General Director's new secretary, a position in which she may be able to find some secrets.
The trio's Team Power Walk fuses into the filming of the episode, with Pacino and Alonso criticizing the differences between the series and reality, while Lola gets settled as the secretary and keeps an eye on any potential trouble, with the director telling her to prevent someone called Ibáñez Serrador from coming in and also requesting she let two men called Hurtado and Ureña. Pacino's attempts to find out who is the scriptwriter end up in failure, but Lola is more successful, finding that it is Ureña, who also has a surprisingly good knowledge of some of the missions Alonso, Amelia and Julián went through - moment in which Narciso "Chicho" Ibáñez Serrador makes his appearance, with Lola telling the man to return the following day.
The filming still goes on, and Alonso and Pacino have to play as a pair of Dirty Communists. However, when the director tells Alonso to give his everything, Alonso gets a bit too much into it and breaks 1960s!Alonso's nose. The actor resigns, but the director is not angry, because he has decided Alonso must be the reincarnation of Alonso de Entrerríos. Lola sends them a message, and the trio returns to the present.
Ureña is a name Salvador knows quite well: not only was he his predecessor in the position of Undersecretary of the Ministry of Time, he also tried to off Salvador in revenge for that change of positions, but the man died in 2011, and also the Ureña Lola saw was a young man. Salvador orders Ureña's arrest, but this may not be enough, for Televisión Española already has the scripts, which are a paean on Francoist Spain and have the characters change Spain's history, and Pacino suggests something: given that the real missions weren't always so good, and that History was much worse, why don't they just replace the scripts with stories based on the real missions? Salvador immediately greenlights the idea, and while Lola, Alonso and Pacino return to 1966 (with Lola telling Chicho that the director does not want to see him, and he ends up throwing his script for Historias para no dormir, the others write at top haste (well, Salvador and Ernesto not so much) to get new scripts.
With scripts in hand, Pacino and Lola sneak into the director's office and replace the scripts, with Pacino rescuing Chicho's script and them getting caught by a security guard, only for Lola to snog Pacino just in time to make the guard believe they just wanted some private nookie, and he tells Pacino off for not taking Lola on a romantic date before doing the kissing.
The following day, the director calls Ureña, furious, because he considers the scripts are an insult towards Spain. Ureña tries to fix the situation, but he hears someone trying to bring down the door and he runs away. In come Alonso and Ernesto, who try to find Ureña and go through a door... that takes them to the year 2011, but they lose track of the man and they return to 1966. Lola convinces the director to give Chicho's Historias para no dormir a chance, and history appears to have returned to its tracks.
But, not so fast: young Ureña meets with his grandfather, the Ureña that tried to have Salvador killed, and who was the one that put him on the path to ensure the Ministry went public. Ureña tells his grandfather he will use the Book of the Doors (which the elder Ureña made a copy of before retiring) in his own benefit.
In the meantime, Ernesto (who took the scripts to 1966) returns to the present, while Pacino, Lola and Alonso stay back for a while, to watch as Chicho begins to film the first episode of his series. This is when Alonso tells the others this will be his last mission: he has promised Elena he will stop working for the Ministry. However, when they return to the present, they do to a wholly remodeled Ministry... which looks more like an airport than anything else, and with tourists coming and going to different times.
As the trio discovers, Ureña took over the Ministry in 2011 and transformed it into an inter-temporal time travel agency, allowing any and all people to go back in time to witness historical or personal events. This appears to have brought Spain out of its economic crisis, but in exchange of pretty much making all of its history a spectacle. A security guard appears and requests the trio's documentation, but Ernesto comes and brings them to the old interrogation chamber, now just a storeroom... and it turns out this Ernesto is their Ernesto, who arrived to 2017 to find it transformed, and where he still worked while most others left or decided to fight against Ureña's Ministry.
While Alonso tries to meet with Elena (who, naturally, does not recognize him), Ernesto takes Lola and Pacino to meet with Salvador. The three tell their (former) boss what happened, and Salvador thunders about the whole "time tourism" thing, pointing out Spain is pretty much selling its soul on it. When Lola suggests returning to the past to stop Ureña, Salvador replies they do not have access to the Book of the Doors, but Pacino reveals he still has the copy of the improved Book Rabbi Leví wrote, including how to travel to the future. However, they do not have the time to make heads or tails of its drawings, because Ureña plans to sell the Ministry to Darrow the next day. So Salvador decides they have passed the Godzilla Threshold: they must destroy the Ministry.
However, there is a problem: the camera Ernesto had thought to be turned off was not, and it filmed him meeting with the trio, including Lola - whom Ureña recognizes as the secretary from earlier.
That night, the group gets into the still existing parts of the Ministry and prepare to blow them up to kingdom come, but after Pacino starts the detonation sequence, Alonso cuts the cables: as he explains, if the Ministry is destroyed, he will not get the chance to meet with Elena, the only things he has left. The guards arrive just then, along with Ureña, and the trio plus Ernesto are handcuffed. After some banter (with Ureña getting called off for the trouble he has caused) the four are sent to 1350, where they, along with prisoners and other men, are hunted by people from the present. However, just in time, they are saved by someone carrying an assault rifle and riding a horse: it's Irene, now sporting an Eyepatch of Power (she says the guy that left her one-eyed is a lot worse).
Irene takes them and the now imprisoned would-be hunters to her group's refuge in 1350, and she tells them of the other troubles Ureña's meddling has caused: while they believe history is not being changed, in reality the constant movement of people to and fro in time has caused multiple viruses and other illnesses to spread in different points in time, and is also creating new and more deadly strains: several towns in different points in time are already dead, and among the still living, but affected, is Angustias. Furious, Lola suggests an idea: spread Angustias' virus to the hunters so it reaches the present, and send a message along for Ureña. The now-ill hunters are taken into quarantine, but it is too late, as some of the tourists catch the virus. Realizing the situation is getting out of hand, Ureña calls Salvador.
The former Ministry Undersecretary, not wanting to go out on a tangent, lays it on Ureña: the illness will kill everyone in Spain within a year, and all other countries will close their borders with Spain to prevent the illness from spreading. Ureña thinks it's just a bluff by Salvador aimed at retaking the position, but Pacino brings up the fact that it is possible to travel to the future, and so he takes Ureña to 2019: in just two years, Madrid is burning, desolate and in ruins, with the only movement coming from jet fighters patrolling the skies, and a newspaper tells that NATO attacked Spain to stop the virus. Thus convinced, Ureña goes back to 2011 to tell himself to not use his knowledge for his own benefit. The trio and Ernesto go back to 1966 (with Salvador destroying Pacino's phone so the knowledge of traveling to the future is lost forever) and the true history is restored.
Salvador congratulates Pacino and Lola on a good job (the mission they had been sent to fulfill), but it is obvious that none but Ernesto knows how close to catastrophe they all were. The two agents decide to go out for drinks, and Alonso finally retires, joining Elena on a run and telling her he has realized that he wants to enjoy his life with her.
And, with Alonso and Elena having earned a happy ending ends the episode... and the series.
THE END
