If it’s supposed to about Ruby, why is that woman back?
First, a tea lady, then a hiker, and someone’s mom and a painting?
If she is THAT twist at the end of the current season, who is she really?
Has she been waiting all this time?
Actually, someone else has…through her.
This week’s episode is expected to reveal Ruby Sunday’s origins, stemming back to the night she was left behind at a church on Ruby Road. Some of the truth will be revealed, but so will a shocking return.
But is there a connection to Ruby in the end?

SPOILERS BELOW

This time, Miss Recurring Woman is a computer genius called Susan Triad (Susan Twist) who promises a new world with software that she’ll give away for free. Of course, it sounds too good to be true. UNIT is tracking her, with Mel (Bonnie Langford) being a mole.
When the Doctor and Ruby return, they’re reunited with Kate Lethbridge-Stewart (Jemma Redgrave), the Vlinx with an upgrade, and Donna’s child Rosie (Yasmin Feeney). It also has a 13-year old scientific advisor named Morris (Lenny Rush), who became much smarter thanks to an asteroid, and a girl named Harriet (Genesis Lynea). Morris looks like a slightly bigger Space Baby, and an episode about how he changed would have been ideal.

So who is Susan Triad, really? There’s lots of theories, like the fact “S Triad” is an anagram for “TARDIS”. That could mean Susan is the Doctor’s granddaughter, but has she regenerated to hide herself. The Doctor said he could recognize her if that is the case. He also knows he brings disaster, and doesn’t want to put his family through that. Kate disagrees, but sees his point of view.

The main concern is finding Ruby’s mother from 2004. UNIT says it could use a Time Window to analyze the VHS tape that showed the woman leaving Ruby behind. This is something Carla (Michelle Greenidge) wants to see for herself. She lets Mrs. Flood (Anita Dobson) take care of her mother while she’s gone. Then Mrs. Flood says “he waits no more” to no one in particular. Say, didn’t she know what a TARDIS is? Will she play a part in what’s coming?
UNIT still hasn’t uncovered anything suspicious about Susan Triad. She seems to be human thanks to DNA samples, but they wonder if she’ll turn into someone else.

The Time Window recreates that Christmas Eve from 2004, with a UNIT soldier named Chidozie (Tachia Newall) inside with the Doctor, Ruby and Mel. Again, Ruby produces the snow while UNIT is stunned. The scene is recreated, but they still can’t see the mother’s face. Ruby is crushed, and Millie really shows devastation and disappointment in that scene. However, the scene also shows the woman pointing at the Doctor…or something else.

Whatever this smoke monster is, Carla calls it the Beast. It swallows and kills Chidozie, which angers UNIT and especially the Doctor.
Is there a connection with Susan Triad?
She finally meets the Doctor, but doesn’t recognize him. Then he asks her about her dreams.
She doesn’t say it immediately, but she’s had bad dreams like being an ambulance in a battlefield, a hiker, an old lady who had a daughter named Lindy…
Yes, she just dreamed this whole season, but why?
She’s the vessel of a monster who knows the Doctor quite well…an Egyptian god who was trapped on Mars…

It wastes no time starting its plans for destruction, killing one of Susan’s assistants before it decides the Doctor is next.
The slow revealing of the true Big Bad is done brilliantly as it’s a legend that may have been accidentally released by the Doctor. Apparently there was more than one harbinger, as Harriet was the other one. She gives a long introduction of Sutekh before he emerges as a literal Dog of Death. It used Susan Triad as an unwitting accomplice, similar to how Sutekh used someone to escape in Pyramids of Mars nearly 50 years ago.

The only person who’s out of the way is Ruby, sealed in the Time Window. Could she wind up seeing her birth mother after all? Even if she does, how can she exist in a dead world, even worse than one without music?
Then again, can she undo what Sutekh has done? It’ll be tougher than keeping a fairy circle intact. It will be a long wait until the season finale, and some concern about whether Russell T. Davies can stick the landing