A Time corridor? Not quite the Time Window that UNIT HQ has in "Legend of Ruby Sunday" — something we've seen before in "The Girl in the Fireplace" and "The Day of the Doctor" — but close enough.

WARNING: Contains SPOILERS for Doctor Who season 14! Doctor Who's season 14 finale will tie back to the Jon Pertwee era and potentially solve a 53-year-old companion mystery. The epic two-parter ...

You may like The trailer for Doctor Who's new season promises new ... a tease of a return to UNIT HQ featuring former companion Ruby (Millie Gibson), and plenty of rocket ships and robots.