Is Cuarto Milenio coming back?

Cuarto Milenio's return is unconfirmed. The show last aired on April 27, 2025, and is currently between seasons.

Cuarto Milenio is a Spanish television series that originally premiered on November 13, 2005, on the network Cuatro. It was a documentary-style program that explored mysteries, paranormal phenomena, and unexplained events, often involving investigations and expert analyses. The series was broadcast over multiple seasons, with its latest season ending in 2025.

The program has a runtime of approximately 120 minutes per episode.