Doctor Who: Lucky Day cast - Full list of major characters in new episode
The new episode centres around Millie Gibson's Ruby Sunday and her new boyfriend Conrad, played by Jonah Hauer-King.
*Warning: Major spoilers ahead for Doctor Who episode Lucky Day.*
This week's episode of Doctor Who, Lucky Day, sees the return of Millie Gibson's Ruby Sunday, who was last seen briefly in 2024 Christmas special Joy to the World.
Adjusting to her life back on Earth without the Doctor, she's faced with taking on a new enemy called the Shreek, along with UNIT and her new boyfriend Conrad.
And while we'd wish Ruby could catch a break and be treated to a happily ever after, Conrad isn't quite who he seems. Played by The Little Mermaid star Jonah Hauer-King, the episode of course picks back up with the Doctor and Belinda, but also features a number of returning actors from season 14 and before.
So, who else stars in the episode and who do they all play? Read on for everything you need to know about the cast of Doctor Who: Lucky Day.
Who's in the cast of Doctor Who: Lucky Day? Full list of characters in season 15 episode 4
The main cast for Doctor Who: Lucky Day is as follows. Scroll on to find out more about the characters, plus where you may have seen the actors previously.
- Millie Gibson as Ruby Sunday
- Jonah Hauer-King as Conrad Clark
- Ncuti Gatwa as The Doctor
- Varada Sethu as Belinda Chandra
- Jemma Redgrave as Kate Lethbridge-Stewart
- Ruth Madeley as Shirley Anne Bingham
- Alexander Devrient as Colonel Christopher Ibrahim
- Aidan Cook as The Vlinx
- Nicholas Briggs as Voice of The Vlinx
- Michelle Greenidge as Carla Sunday
- Angela Wynter as Cherry Sunday
- Faye McKeever as Louise Miller
- Benjamin Chivers as Young Conrad
- Kirsty Hoiles as Moira Clark
- Gethin Alderman as The Shreek
- Kareem Alexander as Jordan Lang
- Madison Stock as Elsa
- Anita Dobson as Mrs Flood
- Paddy Stafford as Sparky
- Blake Anderson as Jack
- Aoife Gaston as Michelle
- Paul Jerricho as Alfie
- Michael Woodford as Derek
- Tina Gray as Audrey
- Reeta Chakrabarti as Herself
- Joel Dommett as Himself
- Alex Jones as Herself
- Selorm Adonu as Influencer 1
- Calypso Cragg as Influencer 2
- James Craven as Influencer 3
Millie Gibson plays Ruby Sunday
Who is Ruby Sunday? Ruby is the Doctor's former companion, who left the TARDIS to return to her old life after the Doctor helped her find her birth mother.
Where have I seen Millie Gibson before? Outside of her role in Doctor Who, Gibson is best known for playing Kelly in Coronation Street, while she has also appeared in Jamie Johnson and Butterfly.
Jonah Hauer-King plays Conrad Clark
Who is Conrad Clark? Conrad poses as an alien-obsessed podcaster and strikes up a romance with Ruby Sunday – but this is all a ruse to target UNIT, with devious con-man Conrad using his digital platforms to amplify dangerous conspiracy theories for financial gain.
Where have I seen Jonah Hauer-King before? Hauer-King is known for his roles in series including World on Fire, The Flatshare and The Tattooist of Auschwitz, as well as films such as A Dog's Way Home, The Little Mermaid and William Tell.
Ncuti Gatwa plays the Doctor
Who is the Doctor? The Doctor is a time traveller from Gallifrey, and the last of the Time Lords. He travels in space and time in the TARDIS. This version of the character is known as the Fifteenth Doctor, although we know there have been a number of additional incarnations.
Where have I seen Ncuti Gatwa before? Beyond his role as the Doctor, Gatwa is best known for his role as Eric Effiong in Sex Education, as well as for starring in Barbie and Masters of the Air.
Varada Sethu plays Belinda Chandra
Who is Belinda Chandra? Belinda is a nurse from London who, in The Robot Revolution, was kidnapped by robots and flown into the stars on their rocket.
At the end of the episode, she told the Doctor to take her home in the TARDIS, but he found himself unable to get back to that particular date, time and location. We don't yet know why this is the case, but ever since then they have been trying to get back.
Where have I seen Varada Sethu before? Sethu is no stranger to Doctor Who, having played Mundy Flynn in last season's episode 3, Boom. She is also known for her roles in series such as Andor, Strike Back, Doctor Foster, Hard Sun and Annika, as well as films including Now You See Me 2, Jurassic World: Dominion and I Came By.
Jemma Redgrave plays Kate Lethbridge-Stewart
Who is Kate Lethbridge-Stewart? Kate is an old friend of the Doctor's and the daughter of the Brigadier, who now runs UNIT. We last saw her in Empire of Death.
Where have I seen Jemma Redgrave before? As well as her role in Doctor Who, Redgrave is also known for appearing in series such as Bramwell, Holby City, Grantchester and Silent Witness, as well as films including Howards End, Red, White & Royal Blue and The Beekeeper.
Ruth Madeley plays Shirley Anne Bingham
Who is Shirley Anne Bingham? Shirley is UNIT's scientific advisor, who we last saw in The Giggle, and was away in Geneva during the events of The Legend of Ruby Sunday/Empire of Death.
Where have I seen Ruth Madeley before? Madeley has had roles in series including Fresh Meat, Outnumbered, Cold Feet, Years and Years, The Long Shadow, Brassic, Renegade Nell and Nightsleeper, as well as films such as Joy and the TV movie Then Barbara Met Alan.
Alexander Devrient plays Colonel Christopher Ibrahim
Who is Colonel Christopher Ibrahim? Colonel Ibrahim is a key soldier at UNIT.
Where have I seen Alexander Devrient before? Devrient has had roles in films such as Sherlock Holmes: A Game of Shadows and The Danish Girl, as well as series including Emmerdale, Industry, Motherland, Ted Lasso and The Lazarus Project.
Michelle Greenidge plays Carla Sunday
Who is Carla Sunday? Carla is Ruby's adoptive mother, who was last seen in Empire of Death.
Where have I seen Michelle Greenidge before? Greenidge has previously had roles in series such as It's a Sin, After Life, Mandy, Code 404, The Witchfinder, Alex Rider, Grantchester, Small Axe, KAOS and Death in Paradise. She has also had roles in films including Cruella and Venom: Let There Be Carnage.
Angela Wynter plays Cherry Sunday
Who is Cherry Sunday? Cherry is Carla's mother and therefore Ruby's grandmother. She was last seen in Empire of Death.
Where have I seen Angela Wynter before? Wynter is best known for playing Yolande in EastEnders, while she has also had roles in series such as Holby City, Cleaning Up, Doctors, Mood, This England, Vampire Academy, Call the Midwife, Three Little Birds and Time.
Benjamin Chivers plays Young Conrad
Who is Young Conrad? Chivers plays a younger version of Jonah Hauer-King's character, Conrad.
Where have I seen Benjamin Chivers before? Chivers is best known for playing Isaac in The Devil's Hour, while he has also had roles in Napoleon and Lockwood & Co.
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Madison Stock plays Elsa
Who is Elsa? Elsa, like Conrad, is part of the activist group Think Tank, which spreads disinformation online about UNIT’s activities.
Where have I seen Madison Stock before? Stock appeared in an episode of Holby City, while she will soon appear in the film One of Us.
Anita Dobson plays Mrs Flood
Who is Mrs Flood? Mrs Flood is a mysterious figure, who previously posed as the next-door neighbour of the Doctor's former companion, Ruby Sunday, and was recently seen posing as the neighbour of Belinda Chandra.
She has a habit of speaking directly to the camera, and has made many threatening assertions towards the Doctor, although he is yet to become aware of her.
Speaking with RadioTimes.com, showrunner Russell T Davies confirmed she is a "villain", and that she will be "popping up every week" – however, we don't expect her true identity to be unveiled until later in the season.
In recent weeks she has been seen following the Doctor, appearing in numerous different guises across different times and places.
Where have I seen Anita Dobson before? Dobson is best known for playing Angie Watts in EastEnders, while she has also appeared in series including Casualty, Call the Midwife, Dodger and Inside No. 9, and took part in Strictly Come Dancing in 2011.
Doctor Who season 15 continues on 3rd May 2025, coming to BBC iPlayer at 8am and airing at 7:10pm on BBC One.
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Authors
James Hibbs is a Drama Writer for Radio Times, covering programmes across both streaming platforms and linear channels. He previously worked in PR, first for a B2B agency and subsequently for international TV production company Fremantle. He possesses a BA in English and Theatre Studies and an NCTJ Level 5 Diploma in Journalism.
