Doctor Who showrunner Russell T Davies explains how the Doctor has forbidden Unit from time travel experiments. Unit's latest time travel innovation sheds light on previously unexplored historical research. The Time Window chamber offers a unique way to look into the past without physically traveling through time.

Russell T Davies explains how Unit's latest attempt at crafting their form of time travel via the Time Window fits into the organization's long-running Doctor Who history. Debuting during the Second Doctor's (Patrick Troughton) era, Unit has safeguarded the Earth from extraterrestrial threat since 1958 and is currently headed by Kate Lethbridge-Stewart (Jemma Redgrave) from their London skyscraper HQ. After a brief appearance in "73 Yards'" alternate timeline, the organization returned in "The Legend of Ruby Sunday" as Ncuti Gatwa's Fifteenth Doctor and Millie Gibson's Ruby Sunday use the Time Window to glimpse at the night of Ruby's abandonment.

Recently, Davies broke...