History YMMV / CuartoMilenio

* AcceptableTargets: Ironically for the program's reputation, medical and health-related pseudosciences, like reiki and homeopathy, tend to be ganged up on by all its guests.

** Álex N. Lachhein, the program's resident nature expert, is another of its most polarizing figures, especially regarding his critical opinions about modern environmentalism and animalism. While some love him, others actually came to the extent of opening a Change petition to remove him from the show (although it was rather unsuccessful, gathering less than 6000 people).

** The program carries a perpetually rowdy reception in pop culture (where there will likely always be people stopping at the "show about ufos and ghosts" label), yet it has also caused what has been described as a true social phenom in Spain and other Spanish-speaking countries.

** Fernando García Echegoyen, a seaman and marine expert, presents one of the most popular sections.

** The 2021 segment with writer Juan Soto Ivars about modern censorship became one of the most liked and popular sections in social media every week.

** Jiménez was once [[https://www.merca2.es/2019/02/02/iker-jimenez-entrevista/ asked]] about former members of the show, specifically if he was referring to them when he previously talked about partners who broke up with him in bad terms for money. While he stated he wasn't talking about "all of them", his wording certainly implies ''some'' of them were. Most of the names mentioned in the interview have been jossed, either because they never really left full time or because different reasons for their departures were given, but the cases of Luis Álvarez and Francisco Contreras Gil remain as a possibility.

** Jiménez's fans don't always get along with those of his former mentor J. J. Benítez, who famously repudiated Jiménez after the latter commented on the Mirlo Rojo affair (a controversy happened in Benítez's own TV show, ''Planeta Encantado'', where a crudely recreated video was made to pass as authentic footage). People on both sides have gone to agree that Benítez overreacted, but the rift is still there.

** At the beginning of the 2020 UsefulNotes/COVID19Pandemic crisis, as soon as January, Jiménez gathered a cadre of science guests who warned that the Spanish government was ill-equipped to manage the virus and that a national catastrophe was surely coming. Spanish press quickly criticized Jiménez and the show for supposedly spreading alarmist nonsense... only for the team's words to turn out ''completely right''. The show and its spinoffs doubled their viewers afterwards, to the point an entirely new series had to be launched, ''[[Series/{{Horizonte}} Informe Covid]]'', where Jiménez brings scientists and doctors every week to inform about the pandemic's current status.

* HilariousInHindsight: In 2020, the troupe of polarizing comedian David Broncano made fun of ''Cuarto Milenio'' during the whole COVID-19 topic, stating the famous prediction was likely sheer luck among random conspiracy theorism, which earned him the ire of many for the perceived slander and inaccuracy. Another comedian, Héctor de Miguel, then discovered that [[BoomerangBigot Broncano had worked under Jiménez]] in the latter's previous radio program ''Milenio 3'' in 2014, something that Broncano himself claimed to have forgotten.

** Every time really weird stuff (not necessarily paranormal) comes up in Spanish media, chances are that either Jiménez and/or ''Cuarto Milenio'' will be namedropped. It spawned an image macro series with Jiménez speaking about mundane oddities. Jiménez himself commented about this, stating how proud he is of having such a hilarious memery weaved about him.

*** Iker Jiménez is Bustamante.[[note]]A variation happened in 2022, when Jiménez shared a pic sporting new sunglasses and haircut, which led people to comment how much they made him look like pop singer David Bustamante.[[/note]]

* RescuedFromTheScrappyHeap: Carmen Porter used to be most disliked member of the team by a wide margin, with fans criticizing her lack of TV skills and accusing of her of being in the show only for being Jiménez's wife. It came to the point that fans often blamed her with literally everything bad that happens in ''Cuarto Milenio'', from members leaving to unpopular decisions being taken, and some even compared her to Music/YokoOno of all people. However, her reception improved dramatically over the years thanks to her entertaining onscreen chemistry with Jiménez, eventually becoming able to comfortably replace Jiménez in ''Series/{{Horizonte}}'' while the latter was ill with COVID in 2022 (she even received her own show around the time, ''Futura'', although it failed to take off).

** Enrique de Vicente is one of the most recognizable guests in the history of the program, but he tends to be very divisive among viewers. Many see him as a mainstay of the show due to his showmanship and colourful stances, but others consider him a conspiracy-obssessed clown who continuously ruins serious debates. A third camp considers him just sufficiently entertaining to be tolerable.
** De Vicente's perennial rival José Manuel Nieves also breaks the fanbase with his appearances. While he is liked for his rational approach, fascinating topics and passion for science, there are still many people who find him overbearing and pedantic, especially when debates turn heated. Even those who side with him sometimes admit that he is a bit too irritable to be an entirely good representative of skepticism in the show.

** The 2021 segment with writer Juan Soto Ivars about modern censorship gained the ire of certain political currents (more often than not, those which were already irate against the show), but it also became one of the most liked and popular sections in social media every week.

** Pablo Fuente became the show's most popular investigator after the UsefulNotes/COVID19Pandemic affair (see below), in some ways taking the place of Camacho. His departure from the show, this time due to his new job in United States, was similarly lamented.
** Fernando García Echegoyen, a seaman and marine expert, has also one of the most popular sections.

** An outlandish theory claims that Pablo Fuente is actually a covert agent of the Centro Nacional de Inteligencia (the Spanish secret service) or some foreign intelligence agency, possibly in partnership with Col. Pedro Baños. The hypothesis does make some entertainingly true points, for instance the fact that Fuente was almost unknown before his tenure with Baños or that his surname happens bizarrely to be the Spanish word for "source", but it is otherwise not an especially popular or believable claim. Jiménez and Fuente have both joked about it, with the former even jokingly claiming that Fuente is really a Russian FSB spy named Pablov Fontenko.

** Even if there's a lot of overlap between both fandoms, there used to be some rivalry with the radio program ''La Rosa de los Vientos'', which is broadcast in a radio station rival to that of Jiménez's old ''Milenio 3'' and directed by another mentor of Jiménez, Juan Antonio Cebrián. Ironically, in this case the bad blood doesn't extend to the creators themselves, as they remained in good terms until Cebrián's death in 2007 (there ''was'' some blood with Cebrián's successor Bruno Cardeñosa, a FriendTurnedRival to Jiménez, but the two eventually reconciled years later, assuring that fans had been overstating their real beef).

** INAO[[note]]The bookshelf in Jiménez's in-show office features a book apparently titled ''INAO'' that becomes especially visible next to his head in close-ups. It's actually an edition of Fernando Jiménez del Oso's ''El síndrome OVNI'' ("The UFO Syndrome") that happens to be overturned, but the fans found the resultant word funny and made it famous, often using it in the place of the real term.[[/note]]

** Images of Jiménez holding up a ''faca'' (a massive razor knife traditionally used in Spain as a street fighting weapon), especially one in which he looks hilariously fascinated with it, became popular in 2021 after a reportage on the topic. It was photoshopped in plenty and is still posted whenever Jiménez gets critical and/or combative on media.

* RescuedFromTheScrappyHeap: Carmen Porter used to be most disliked member of the team by a wide margin, with fans criticizing her lack of TV skills and accusing of her of being in the show only for being Jiménez's wife. It came to the point that fans often blamed her with literally everything bad that happens in ''Cuarto Milenio'', from members leaving to impopular decisions being taken, and some even compared her to Music/YokoOno of all people. However, her reception improved dramatically over the years thanks to her entertaining onscreen chemistry with Jiménez, eventually becoming popular enough to receive her own successful show, ''Futura'', and even comfortably replace Jiménez in ''Series/{{Horizonte}}'' while the latter was ill with COVID in 2022.

** Images of Jiménez holding up a ''faca'' (a massive razor knife traditionally used in Spain as a street fighting weapon), especially one in which he looks hilariously [[KnifeNut fascinated]] with it, became popular in 2021 after a reportage on the topic. It was photoshopped in plenty and is still posted whenever Jiménez gets critical and/or combative on media.

** Enrique de Vicente is one of the most recognizable guests, but he tends to be very divisive among viewers. Many see him as a mainstay of the show due to his showmanship and colourful stances, but others consider him a conspiracy-obssessed clown who continuously ruins serious debates. A third camp considers him just sufficiently entertaining to be tolerable.
** De Vicente's perennial rival José Manuel Nieves also breaks the fanbase with his appearances. While he is liked for his rational approach and passion for science, there are many people who find him overbearing and pedantic, especially when debates turn heated. Even those who side with him sometimes admit that he is too irritable to be an entirely good representative of skepticism in the show.
** Jaime "Jaigar" Garrido acts essentially as a serious, even smug version of De Vicente, which makes him a more conventional debater at the cost of lacking all of his partner's NarmCharm. Some like him better, while others see him as intensely unpleasant in comparison.
** Álex N. Lachhein, the program's resident nature expert, is another of its most polarizing figures, especially regarding his critical opinions about ecologism and animalism. While some love him, others actually came to the extent of signing a Change petition to remove him from the show.

** The program sports a perpetually rowdy reception both in pop culture and from official voices (which often stop at the "show about ufos and ghosts" label) yet also has carved something which has been described as a social phenom in Spain and other Spanish-speaking countries.
** The note in brackets above has its own debate. As people watch ''Cuarto Milenio'' for a variety of topics, you can find classical mystery/entertainment fans clashing against more science-oriented people about which field should the show focus on.
** The 2021 segment with writer Juan Soto Ivars about modern censorship gained the ire of certain political currents, but it also became one of the most liked sections in social media every week.
* CriticProof: The whole show is an example of this, having been attacked by all sorts of journalists, politicians and other people with reasons to do so, yet also being easily one of the most sustainedly successful Spanish TV programs ever.

** Pablo Fuente became the show's most popular investigator after the UsefulNotes/COVID19Pandemic affair (see below), in some ways taking the place of Camacho. His departure from the show, this time due to , was
** Col. Pedro Baños is also a favorite due to his first-hand knowledge of geopolitics and expressive style. He received his own short-lived spinoff show, ''La mesa del coronel'', thanks to it.

** Jiménez was once [[https://www.merca2.es/2019/02/02/iker-jimenez-entrevista/ asked]] about former members of the show, specifically if he was referring to them when he previously talked about partners who broke up with him in bad terms for money. While he stated he wasn't talking about "all of them", his wording certainly implies ''some'' of them were. Most of the names mentioned in the interview have been jossed, either because they never really left full time or because different reasons for their departures were revealed, but the cases of Luis Álvarez and Francisco Contreras Gil remain as a possibility.
** An outlandish theory claims that Pablo Fuente is actually a covert agent of the Centro Nacional de Inteligencia (the Spanish secret service) or any foreign intelligence agency, possibly in partnership with usual guest Col. Pedro Baños. The hypothesis does make some entertainingly true points, for instance the fact that Fuente was almost unknown before his tenure with Baños and Jiménez or that his surname happens bizarrely to be the Spanish word for "source", but it is otherwise not an especially popular or believable claim.

** Jiménez's fans often don't get along with those of his former mentor J. J. Benítez, who famously repudiated Jiménez after the latter commented on the Mirlo Rojo affair (a controversy happened in Benítez's own TV show, ''Planeta Encantado'', where a recreated video was made to pass as true footage). Many people on both sides have acknowledged Benítez undoubtedly overreacted, but the rift is still there.
** Even if there's a lot of overlap between both fandoms, there used to be some with the radio program ''La Rosa de los Vientos'', which is broadcast in a radio station rival to that of Jiménez's old ''Milenio 3'' and directed by another mentor of Jiménez, Juan Antonio Cebrián. Ironically, in this case the bad blood doesn't extend to the creators themselves, as they remained in good terms until Cebrián's death in 2007 (there ''was'' some with Cebrián's successor Bruno Cardeñosa, a friend turned- ival to Jiménez, but the two eventually reconciled years later, assuring that fans had been overstating their real beef over the years).
** The hosts of science show ''Órbita Laika'', from rival network RTVE, tried to invoke this kind of rivalry a couple times, though they mostly failed due to their own show's obscurity.

** At the beginning of the 2020 UsefulNotes/COVID19Pandemic crisis, as soon as January, Jiménez gathered a cadre of science guests who warned that the Spanish government was ill-equipped to manage the virus and that a national catastrophe was surely coming. Spanish press quickly criticized Jiménez and the show for supposedly spreading alarmist nonsense... only for the team's words to turn out '''completely right'''. The show and its spinoffs doubled their viewing afterwards, to the point an entirely new series had to be launched, ''[[Series/{{Horizonte}} Informe Covid]]'', where Jiménez brings scientists and doctors every week to inform about the pandemic's current status.
** As mentioned above, the guests of science show ''Órbita Laika'' used to take potshots at ''Cuarto Milenio'' for including ufology between its usual topics. Years later, it became known that Ángel Martín, ''Órbita Laika'''s first host, had suffered a psychotic break a year after his tenure in the show and had passed time in a psychiatric hospital while hallucinating with aliens and ufos of all things.
* MemeticBadass: Former member Luis Álvarez became briefly one due to a reportage about UsefulNotes/JackTheRipper in Whitechapel, which saw Álvarez smoking a cigar in a hilariously matter-of-fact way while speaking about the murderer.

** Every time really weird stuff (not necessarily paranormal) comes up in Spanish media, chances are that either Jiménez and/or ''Cuarto Milenio'' will be namedropped. It spawned an image macro series with Jiménez speaking about mundane oddities.

** The brawls between De Vicente and José Manuel Nieves also feature a lot in memes, which often portray them as boxers or FightingGame characters facing off. After so many years, the joke became an AscendedMeme around 2020, and it was later nicknamed "[[Franchise/MortalKombat Tertullian Kombat]]" due to a fan's artwork about it.

** INAO[[note]]The bookshelf in Jiménez's in-show office features a book apparently titled ''INAO'' that becomes especially visible in close-ups. It's actually an edition of Fernando Jiménez del Oso's ''El síndrome OVNI'' ("The UFO Syndrome") that happens to be overturned, but the fans found the resultant word funny and made it famous, often using it in the place of the real term.[[/note]]
** "The guy of the ghosts"[[note]]In 2020, Jiménez was interviewed in the podcast ''Tiempo de Juego COPE'' about the events covered above in Harsher in Hindsight, specifically asked about how the affair had allowed him to shed his "ghosts and ufos" image and be appreciated as a true divulgation journalist. However, the show's member tasked with introducing Jiménez, Víctor Fernández, had the occurrence to laugh and present him jokingly as "the guy of the ghosts" - [[OpenMouthInsertFoot exactly the thing which the podcast's episode was being set against.]] The joke attracted a ton of criticism and attacks, with people calling Fernández an unprofessional idiot and labelling the moment as an EpicFail for the entire podcast.[[/note]]

* TheScrappy:
** Carmen Porter is the most disliked member of the team by a wide margin, with fans often criticizing her lack of TV skills and accusing of her of being in the show only for being Jiménez's wife. It came to the point that fans often blamed her with literally everything bad that happens in ''Cuarto Milenio'', from members leaving to impopular decisions being taken, and some even compared her to Music/YokoOno of all people. Her reception improved over the years, especially thanks to the entertaining viral video segments she shares with Jiménez, but she has not completely lost the heat.
** Clara Tahoces is considered one of the most (if not the ''most'') boring collaborators of the show. It doesn't help that she is a personal friend to Porter, fueling rumors that the latter pressed to have her in the program.

** Pablo Fuente became the show's most popular investigator after the UsefulNotes/COVID19Pandemic affair (see below), in some ways taking the place of Camacho.

** Jiménez's fans often don't get along with those of his former mentor J. J. Benítez, who famously repudiated Jiménez after the latter commented on the Mirlo Rojo affair (a controversy happened in Benítez's own TV show, ''Planeta Encantado'', where a recreated video was made to pass as a true recording). Many people on both sides have acknowledged Benítez undoubtedly overreacted, but the rift is still there.
** Even if there's a lot of overlap between both fandoms, there used to be some with the radio program ''La Rosa de los Vientos'', which is broadcast in a radio station rival to that of Jiménez's old ''Milenio 3'' and was directed by another mentor of Jiménez, Juan Antonio Cebrián. Ironically, in this case the bad blood doesn't extend to the creators themselves, as they remained in good terms until Cebrián's death in 2007 (there ''was'' some with Cebrián's successor Bruno Cardeñosa, but he and Jiménez eventually reconciled, also clarifying that fans had been overstating their real beef over the years).

* GermansLoveDavidHasselhoff: ''Cuarto Milenio'' has quite of a following in rest of the Hispanosphere, with many Latin American viewers watching it online.

** "The guy of the ghosts"[[note]]In 2020, Jiménez was interviewed in the podcast ''Tiempo de Juego COPE'' about the events covered above in Harsher in Hindsight, specifically asked about how the affair had allowed him to shed his "ghosts and ufos" image and be appreciated as a true divulgation journalist. However, the show's member tasked with introducing Jiménez, Víctor Fernández, had the occurrence to laugh and present him jokingly as "the guy of the ghosts" - [[OpenMouthInsertFoot exactly the thing which the podcast's episode was set against.]] The joke attracted a ton of criticisms and attacks, with people calling Fernández an unprofessional idiot and labelling the moment an EpicFail for the entire podcast.[[/note]]

* NauseaFuel: The reportage about Spanish bandolero Tragabuches included some delightful stories to revolve the guts, like that of a bullfighter ripping off his own, hanging half-plucked out eye, or that of the title bandit devouring a donkey fetus, with an appropriate recreation featuring actors hamming up the {{Squick}} factor.

* FandomRivalry: The hosts of science show ''Órbita Laika'', from rival network RTVE, tried to invoke this a couple times, though they failed due to their own show's obscurity.

** A scene with Jiménez stating "more mysterious than this, few things (are)" is popular as a reaction take in Website/YouTube.

* HarsherInHindsight: At the beginning of the 2020 UsefulNotes/COVID19Pandemic crisis, as soon as January, Jiménez gathered a cadre of science guests who warned that the Spanish government was ill-equipped to manage the virus and that a national catastrophe was surely coming. Spanish press quickly criticized Jiménez and the show for supposedly spreading alarmist nonsense... only for the team's words to turn out '''completely right'''. The show and its spinoffs doubled their viewing afterwards, to the point an entirely new series had to be launched, ''[[Series/{{Horizonte}} Informe Covid]]'', where Jiménez brings scientists and doctors every week to inform about the pandemic's current status.

** The brawls between De Vicente and José Manuel Nieves also feature a lot in memes, which often portray them as boxers or FightingGame characters facing off. After so many years, the joke became an AscendedMeme around 2020, and it was later nicknamed "Tertullian Kombat" due to a fan's artwork about it.

** Carmen Porter is the most disliked member of the cast by a wide margin, with fans often panning her lack of TV skills and speculating that she is in the show only for being Jiménez's wife. It comes to the point that fans often blame her with literally everything bad that happens in ''Cuarto Milenio'', from members leaving to impopular decisions being taken. Some have even compared her to Music/YokoOno of all people.

** The brawls between De Vicente and José Manuel Nieves also feature a lot in memes, which often portray them as boxers or FightingGame characters facing off. After so many years, the joke became an AscendedMeme in 2021.

** Images of Jiménez holding up a ''faca'' (a massive razor knife traditionally used in Spain as a street fighting weapon), especially one in which he looks hilariously fascinated with it, became popular in 2021 after a reportage on the topic. It was photoshopped in plenty and is still posted whenever Jiménez gets critic and/or combative on media.

** An outlandish theory claims that Pablo Fuente is actually a covert agent of the Centro Nacional de Inteligencia (the Spanish secret service), possibly in partnership with usual guest Col. Pedro Baños. The hypothesis does make some entertainingly true points, for instance the fact that Fuente was almost unknown before his tenure with Baños and Jiménez or that his surname happens bizarrely to be the Spanish word for "source", but it is otherwise not an especially popular or believable claim.

** The brawls between De Vicente and José Manuel Nieves also feature a lot in memes, which often portray them as boxers or FightingGame characters facing off.

* AcceptableTargets: Medical and health-related pseudosciences, like reiki and homeopathy, tend to be ganged up on by all the guests.

** Pablo Fuente became the show's main investigator after the COVID-19 affair (see below), in some ways taking the place of Camacho.

* HarsherInHindsight: At the beginning of the 2020 UsefulNotes/COVID19Pandemic crisis, as soon as January, Jiménez gathered a cadre of science guests who warned that the Spanish government was ill-equipped to manage the virus and that a national catastrophe was surely coming. Spanish press quickly criticized Jiménez the show for supposedly spreading alarmist nonsense... only for the team's words to turn out '''completely right'''. The show and its spinoffs doubled their viewing afterwards, to the point an entirely new series had to be launched, ''Informe Covid'', where Jiménez brings scientists and doctors every week to inform about the pandemic's current status.

* MemeticBadass: Former member Luis Álvarez became briefly one due to a reportage about UsefulNotes/JackTheRipper in Whitechapel, which saw Álvarez calmly smoking a cigar in a hilariously matter-of-fact way while speaking about the murderer.

** Every time really weird stuff (not necessarily paranormal) comes up in Spanish media, chances are that Jiménez and/or ''Cuarto Milenio'' will be namedropped. It spawned an image macro series with Jiménez speaking about mundane oddities.

** "The guy of the ghosts"[[note]]In 2020, Jiménez was interviewed in the podcast ''Tiempo de Juego COPE'' about the events covered above in Harsher in Hindsight, specifically asked about how the affair had allowed him to shed his "ghosts and ufos" image and be appreciated as a true divulgation journalist. However, the show's member tasked with introducing Jiménez, Víctor Fernández, had the occurrence to laugh and present him jokingly as "the guy of the ghosts" - [[OpenMouthInsertFoot exactly the thing which the podcast's episode was against.]] The joke attracted a ton of criticisms and attacks, with people calling Fernández an unprofessional idiot and labelling the moment an EpicFail for the entire podcast.[[/note]]

* EnsembleDarkhorse: Santiago Camacho was one of the most popular collaborators of ''Cuarto Milenio'', as attested by the success of his podcast ''Días Extraños'' since he left the show. Many people lamented the ExecutiveMeddling that led him to depart in the first place.

* HarsherInHindsight: At the beginning of the 2020 coronavirus crisis, Jiménez was criticized for supposedly spreading alarm about the virus, even although the info came from his science guests and not from him. Weeks later, their "alarming" words about the impending pandemic turned out completely right.
* GermansLoveDavidHasselhoff: ''Cuarto Milenio'' has apparently quite of a following in rest of the Hispanosphere, with many Latin American viewers watching it online.

** "The guy of the ghosts"[[note]]When Jiménez was interviewed in the podcast ''Tiempo de Juego COPE'' about the events covered above in Harsher in Hindsight, one of the show's members, Víctor Fernández, still introduced him jokingly as just "the guy of the ghosts" - which was precisely what the previous controversy had been about. The joke attracted many criticisms and attacks, with people calling Fernández an unprofessional idiot and defending Jiménez for his work on the pandemic.[[/note]]
* NightmareFuel: Many of the program's topics can be sinister, morbid or just plain scary, so it has a reputation to be unsafe to watch by impressionable people and/or with the room's lights off (especially back when high-budgeted recreation sequences, the aptly named ''Diarios del Miedo'', were part of the show). Jiménez often comments he must place the most horrifying contents late into the show's running time if he doesn't want to lose any share.

** Enrique de Vicente is one of the most recognizable guests, but he tends to be very divisive among viewers. Many see him as a hilarious part of the show due to his showmanship and colourful stances, but others consider him a conspiracy-obssessed clown who continiously ruins serious debates. A third camp considers him just sufficiently entertaining to be tolerable.

* MemeticBadass: Former member Luis Álvarez became briefly one due to a reportage about Jack the Ripper in Whitechapel, which saw Álvarez calmly smoking a cigar in a hilariously matter-of-fact way while researching about the murderer.

* NightmareFuel: Many of the program's topics can be sinister, morbid or just plain scary, so it has a reputation to be unsafe to watch by impressionable people and/or with the lights off (especially back when high-budgeted reconstruction sequences, the aptly named ''Diarios del Miedo'', were part of the show). Jiménez often comments he must place the most horrifying contents later into the show's running time if he doesn't want to lose share.

** Carmen Porter is the most disliked member of the cast by a wide margin, with fans often panning her lack of TV skills and speculating that she is in the show only for being Jiménez's wife. It comes to the point that fans often blame her with literally everything bad that happens in the show, from members leaving to impopular decisions being taken. Some have even compared her to Music/YokoOno of all people.

* EnsembleDarkhorse:
** Santiago Camacho was one of the most popular collaborators of ''Cuarto Milenio'', as attested by the success of his podcast ''Días Extraños'' since he left the show. Many people lamented the ExecutiveMeddling that led him to depart in the first place.
** Enrique de Vicente is also one of the most recognizable guests of the show, even if it is often due to the sheer NarmCharm of his showmanship and opinions.
* FandomRivalry: The presenters of science show ''Órbita Laika'', from rival network RTVE, tried to invoke this a couple times, though mostly failing due to their own show's obscurity.

** Enrique de Vicente is also parodied with some frequency due to his over the top opinions, the favorite meme being him stating "I'm not saying it is a conspiracy... but it ''is'' a conspiracy," in parody to [[Series/AncientAliens Giorgio Tsoukalos]]'s infamous meme about aliens.
** The brawls between De Vicente and José Manuel Nieves also feature a lot in memes, often portraying them as boxers or FightingGame characters facing off.
* NightmareFuel: Many of the program's topics can be sinister, morbid or just plain scary, and the show itself has a reputation to be unsafe to watch with the lights off by impressionable people (especially back when the aptly named ''Diarios del Miedo'', high-budgeted reconstruction sequences, were part of the show). Jiménez has admitted he is forced to place those contents later into the show's running time if he doesn't want to lose share.

* NightmareFuel: Many of the program's topics can be sinister, morbid or just plain scary, and the show itself has a reputation to be unsafe to watch with the lights off by impressionable people (especially back when the aptly named ''Diarios del Miedo'', high-budgeted reconstruction sequences, were part of the show). Jiménez has admitted he is forced to place those contents later into the show's time if he doesn't want to lose share.

* EnsembleDarkhorse: Santiago Camacho was one of the most popular collaborators of ''Cuarto Milenio'', as it attests the success of his podcast ''Días Extraños'' since he left the show. Many people lamented the ExecutiveMeddling that led him to depart in the first place.
* FandomRivalry: The presenters of science show ''Órbita Laika'', from rival network RTVE, tried to invoke this a couple times.

** Every time really weird stuff (not necessarily paranormal) comes up in Spanish media, chances are that Jiménez and/or ''Cuarto Milenio'' will be mentioned. It spawned an image macro series with Jiménez speaking about mundane oddities.

** The brawls between De Vicente and José Manuel Nieves also feature a lot in memes, often portraying him as boxers or videogame martial artists facing off.

** Carmen Porter is the most disliked member of the cast by a wide margin, with fans often panning her lack of TV skills and entertaining that she is in the show only for being Jiménez's wife. It comes to the point that fans often blame her with literally everything bad that happens in the show, from members leaving to impopular decisions being taken. Some have even compared her to Music/YokoOno of all people.
** Clara Tahoces is considered one of the most (if not the ''most'') boring collaborators of the show. It doesn't help that she is a personal friend to Porter and that it is rumored that the latter pressed to have her in the program.

* FandomRivalry: The presenters of science show ''Órbita Laika'', from rival network RTVE, tried to invoke this a few times.

* NightmareFuel: Many of the program's topics can be sinister, morbid or just plain scary, and the show itself has a reputation to be unsafe to watch with the lights off by impressionable people (especially back when high-budgeted reconstruction sequences were part of the show). Jiménez has admitted he is forced to place those contents later into the show's time if he doesn't want to lose share.

* NightmareFuel: Many of the topics of the show can be sinister, morbid or just plain scary, and the show itself has a reputation to be unsafe to watch with the lights off by impressionable people. Jiménez has admitted he is forced to place those contents later into the show's time if he doesn't want to lose share.