According to the cast list for the penultimate 2024 Doctor Who series, The Legend of Ruby, Susan Twist plays Susan Triad of Triad Technology.
But she is also seen in two terrifying new forms in frames from the Next Time trailer for the episode. One looks demonic and another resembles a cyborg.
Yet in her Susan Triad form, she whimpers, “In every dream, I’m there!” the logo for Triad technologyy is visible in the background.
Twist’s first appearance is in the the Doctor Who 60th anniversary special Wild Blue Yonder where she played Sir Isaac Newton’s housekeeper Mrs Merridew on the fateful day he came up with the concept of mavity.
Her second appearance is in the Doctor Who Christmas special where she played a hippie-like lady who heckles Ruby’s band at King’s Arms with an odd request for them to play Gaudete.
Her third appearance is in Space Babies. This time we see her in a pre-recorded video as Comms Officer Gina Scalzi, protesting the abandonment of the baby farm.
Her fourth appearance is as a gobby Tea Lady at the commissary at EMI Recording Studios in The Devil’s Chord.
Her fifth appearance is as an automated ambulance interface in Boom.
Her sixth appearance is as a friendly hiker who is frightened by The Woman in 73 yards.
Her Seventh appearance is as Penny Pepper Bean, Lindy Pepper Bean’s mother in Dot and Bubble. At this point, the Doctor and Ruby both recognize her as a familiar face.
Her eighth appearance is as the portrait of the late Duchess of Pemberton in Rogue.
Twist appeared in one of the 2024 series trailers as Susan Triad of Triad Technology in a scene from one of the two-part finale episodes, consisting of The Legend of Ruby Sunday and Empire of Death.
Triad Technology is used by UNIT, Unified Intelligence Taskforce. The Triad Technology logo appeared on a bus used for The Church on Ruby Road filming and it also appears in one of the 2024 series trailers.
Who is Susan Triad? Fan theories vary. She has the same first name as the Doctor’s granddaughter and S Triad is an anagram of TARDIS. Her frequent appearances so far run from earthy to rude to dissenting to course to brusque to helpful to treacly and ultimately read as omnipresent, powerful and sinister. It will be interesting to see who and what she turns out to be.
Written by Russell T Davies and directed by Jamie Donoughue, The Legend of Ruby Sunday will stream on 15 June 2024 midnight, 00:00 BST (14 June 7:00pm ET) on BBC iPlayer in the UK and Ireland and Disney+ everywhere else, where available. The Legend of Ruby Sunday will also broadcast on BBC One in the UK on 15 June at 6:45pm. On 22 June, the final episode of the series, Empire of Death will stream on iPlayer and Disney+.