Dark Ages

The Dark Ages were an era in human history following the fall of the Roman Empire.

The Rani was present during the Dark Ages at some point, extracting chemicals from the brains of humans. (DW: The Mark of the Rani)

Rose Tyler suggested that Sarah Jane Smith was from the Dark Ages soon after they met. (DW: School Reunion)

Jorjie Turner suggested using the Space-Time Manipulator to visit the Dark Ages. (K9TV: Liberation)