Cuarto milenio
Cuarto milenio is a Spanish television program directed and presented by journalist Iker Jiménez and Carmen Porter. The program has been broadcast weekly on television channel Cuatro since November 2005, being the channel's oldest active program. The program explores a wide variety of topics, usually related to mystery and enigmas, though frequently reaching afield. They include conspiracy, archaeology, history, criminology, astronomy, medicine, physics, zoology, psychology, parapsychology and ufology. It features habitually the participation of experts in various disciplines, like psychiatrists, physicists, physicians, historians, anthropologists, criminologists, astronomers, naturalists, writers or journalists. "Cuarto Milenio" has been acknowledged to have  an established place on Spanish television, not only due to its longevity, but also to its following and recognizability, having been considered a televisive phenomenon. Alternatively, it has been criticized as pseudoscientifical, pointing to its treatment of esoteric and conspiratorial fields, and praised as a program of investigation and divulgation, standing out by its consistent presence of scientific authorities and specialists as guests. The program originated the creation of two spin-offs, "La mesa del coronel", a geopolitical program presented in 2019 by Col. Pedro Baños, and "Horizonte", produced by the same team and ongoing since 2020. Specials. On May  16, 2006, "Cracking the Code" aired, marking the theatrical release of "The Da Vinci Code". The director and presenter of "Cuarto Milenio" conducted a special program that addressed the secrets and controversies raised by the book. On December 25, 2006, "The Exodus Decoded" special aired. This program discussed the documentary and research done by Felix Golubev and Simcha Jacobovici, about a proposed Jewish exodus from Egypt. In 2007 the program aired a special about Jesus. A special emphasis was given to the apocryphal gospels. In July 2008 a special on Chernobyl aired. In April 2012 they presented a special about  the sinking of the RMS Titanic. Collections. "Colección Cuarto milenio" was a book-DVD collection that included best programs of the first few seasons, which were available weekly in kiosks. There was another set released in 2011. Seasons. Cuarto Milenio is the oldest program of Cuatro, having been broadcast continuously since the channel began service in November 2005. The best ratings for the show were in the third season (2007–2008), with an average audience share of 13.2% (897,208 viewers). During the following seasons, the show has maintained an average audience of 600,000 viewers per night, representing around 10% of the  audience share, the only program on Cuatro to reach such a high percentage.