Cuarto Milenio trata sobre cualquier tema relacionado con el mundo del misterio y lo desconocido, entre los que destacan: conspiración, ocultismo, criminología, astronomía, ufología, psicología, parapsicología, demonología, arqueología, historia, zoología o física. El programa cuenta habitualmente con la participación de científicos y expertos en diversas materias como psiquiatras, físicos, historiadores, antropólogos, criminólogos, astrónomos, naturalistas, escritores o periodistas. Dirigido y presentado por los periodistas Iker Jiménez y Carmen Porter, se emite semanalmente en la cadena española Cuatro, desde noviembre de 2005. Contó desde el principio con un programa radiofónico "hermano" titulado Milenio 3 (que empezó el 1 de junio de 2002 y finalizó el 28 de junio de 2015) y capitaneado por el mismo equipo, en la Cadena SER.
| Season | From | To | Episodes |
|---|---|---|---|
| All Seasons | |||
| Specials | May 2006 | February 2021 | 37 |
| Season 1 | November 2005 | July 2006 | 36 |
| Season 2 | September 2006 | July 2007 | 44 |
| Season 3 | September 2007 | July 2008 | 47 |
| Season 4 | September 2008 | July 2009 | 46 |
| Season 5 | September 2009 | June 2010 | 36 |
| Season 6 | September 2010 | July 2011 | 40 |
| Season 7 | September 2011 | September 2012 | 42 |
| Season 8 | September 2012 | September 2013 | 48 |
| Season 9 | September 2013 | July 2014 | 45 |
| Season 10 | September 2014 | July 2015 | 44 |
| Season 11 | September 2015 | July 2016 | 44 |
| Season 12 | September 2016 | July 2017 | 44 |
| Season 13 | September 2017 | July 2018 | 44 |
| Season 14 | September 2018 | July 2019 | 44 |
| Season 15 | September 2019 | December 2020 | 44 |
| Season 16 | January 2021 | July 2021 | 27 |
| Season 17 | September 2021 | July 2022 | 46 |
| Season 18 | September 2022 | July 2023 | 44 |
| Season 19 | September 2023 | July 2024 | 43 |
| Season 20 | September 2024 | December 2024 | 14 |
| Unassigned Episodes | 4 |
| Season | From | To | Episodes |
|---|---|---|---|
| Specials | 0 | ||
| Unassigned Episodes | 863 |
| Season | From | To | Episodes |
|---|---|---|---|
| Season 1 | 0 | ||
| Unassigned Episodes | 863 |
| Name | Number of Episodes | Dates | |
|---|---|---|---|
| Iker Jiménez | 481 | 09/10/2006 - 07/21/2019 | |
| Iker Jimenez | 126 | 09/09/2007 - 04/24/2016 |
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