Doctor Who Episode 4, ’73 Yards’, just debunked one of Season 14’s biggest fan theories surrounding Ruby Sunday, and it used an emotional twist to do it. (Warning: spoilers ahead!)

’73 Yards’ has quickly proven itself as the strongestDoctor Who episodeto come from the latest season so far. (Just read our’73 Yards’ reviewfor further proof!) AsRuby Sundayfinds herself lost in 21st century Wales after the Doctor disappeared within an instant, she’s stalked by a looming figure who never strays more or less than 73 yards behind her.

Ruby has been one of the most enigmatic characters on the sci-fi show to date, with her status as an adopted child leading to all sorts ofSeason 14 theories. Her birth mother’s identity and the reason behind her ability to bring memories into reality have all been the subject of debate, but one of the most frequently referred-to theories is thatMrs Flood(Ruby’s quirky and oddly-knowledgeable neighbor) is actually Ruby in the future.

However, ’73 Yards’ has just put this theory to an end for one simple reason:it shows us what an older Ruby looks like, and it’s not Mrs Flood.

The episode stretches through time, following Ruby throughout decades of her life without the Doctor. Eventually, she’s an old woman, still followed by the strange presence, even when she’s in a care home. It’s a lonely and emotional arc for the Doctor’s companion, but it proves one thing. The fact is, “old Ruby” is not Mrs Flood.

Ruby’s old self might still be a few years older than Mrs Flood, but they aren’t the same person. We also hear Ruby’s older voice, and that doesn’t sound like her neighbor, either.

Related:

Related:

As such, this crosses the Mrs Flood theory off the list of potential Ruby revelations. However, the door is still open for plenty of others. (Including the fact that Ruby could potentially be theDoctor’s great-granddaughter.)

For more, find outwhen the new episode of Doctor Who is out. You can also remind yourself ofhow to watch Doctor Who Season 14, and take a look at all theDoctor Who Season 14 villains.

Jessica Cullen is a TV and Movies Writer on Dexerto’s UK team. She’s previously written for The Digital Fix, Cosmopolitan, Refinery29, Slate and more. Aside from being the residential Yellowstone expert, she also loves Westerns, ’90s action movies, and true crime. You can email her here: jessica.cullen@dexerto.com.