Who is Kate Lethbridge-Stewart in Doctor Who? The UNIT boss, explained

Kate Lethbridge-Stewart has been a part of Doctor Who for over a decade. Here's everything you need to know about the UNIT scientist.

Jemma Redgrave as Kate Lethbridge-Stewart in Doctor Who

Who is Kate Lethbridge-Stewart in Doctor Who? Returning showrunner Russell T Davies has celebrated Doctor Who’s 60th anniversary with three mega specials, concluding in ‘The Giggle’.

Enter: Kate Lethbridge-Stewart. She’s a character from Doctor Who‘s past, and has been ever-present in the franchise since the 2012 episode ‘The Power of Three’. She now has a longstanding relationship with The Doctor, but you probably need a refresher as it’s been a while since we last saw her.

Who is Kate Lethbridge-Stewart in Doctor Who?

Kate Lethbridge-Stewart is the Chief Scientific Adviser to UNIT, and the daughter of Brigadier Sir Alistair Gordon Lethbridge-Stewart, a character who had been a part of the show since the 1960s.

Played by Jemma Redgrave, she first appeared in the episode ‘The Power of Three’ during the series’ seventh series. She works with The Doctor to help defend Earth from extraterrestrial threats. Kate’s appearance in Doctor Who is a continuation of the legacy of her father, Brigadier Lethbridge-Stewart, who was a prominent figure in UNIT and had a long history with the Doctor. Kate Stewart’s inclusion in the modern series is a nod to this legacy and serves to continue the connection between the Doctor and UNIT.

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However, Kate Lethbridge-Stewart now holds her own position in the franchise’s history too. She also represents strong, capable, and intelligent leadership within UNIT, making her an important and worthy ally of The Doctor. Now, in ‘The Giggle’ she’s helping The Doctor face down the threat posed by The Toymaker.

For more on Doctor Who, read our guide to the TARDIS, or see our picks for the 10 best David Tennant episodes. Or, you can see our choices for the best sci-fi series of all time.