Doctor Who ‘Boom’ cast list

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The cast list for the third 2024 Doctor Who series episode Boom, written by Steven Moffat, was released on the BBC One listing for the programme.

In the episode, the Doctor and Ruby are caught in the middle of a devastating war on Kastarion 3, a world on the farthest edges of the galaxy. The Kastarions themselves can’t be seen, hiding in the fog. The planetary battlefield is all traps, smoke, mud, danger an ruins and the Doctor is trapped when he steps on a landmine. The Doctor must hold his nerve to save himself and Ruby, plus the entire planet… without moving. In the midst of this, the Doctor and Ruby meet someone who might, one day, change their lives forever.

The cast list:

The Doctor: Ncuti Gatwa
Ruby Sunday: Millie Gibson
John Francis Vater: Joe Anderson
Carson: Majid Mehdizadeh-Valoujerdy
Splice Alison Vater: Caoilinn Springall
Canterbury James Olliphant: Bhav Joshi
Ambulance: Susan Twist

In the episode, Carson says to the Doctor (via Total TV Guide), “Some of the men think the Kastarions are in the fog. Like… they are made of fog.”

Susan Twist makes another mysterious appearance as Ambulance after appearing as Tea Lady in Episode 2, The Devil’s Chord. She possibly appears in Episode 1, Space Babies as well though she isn’t credited on the listing for the episode. Twist previously appeared in the Doctor Who specials, playing Sir Isaac Newton’s housekeeper Mrs. Merridew in Wild Blue Yonder and the hippie lady who heckles Ruby’s band in The Church on Ruby Road. Twist will appear later in the series as Susan Triad.

Written by Steven Moffat and directed by Julie Anne Robinson, Boom will stream on 18 May 2024 midnight, 00:00 BST (17 May 7:00pm ET) on BBC iPlayer in the UK and Ireland and Disney+ everywhere else, where available. Boom will also broadcast on BBC One in the UK on 18 May at 6:50pm.

But before that, Doctor Who, returns on 11 May 2024 midnight, 00:00 BST (10 May 7:00pm ET) streaming on BBC iPlayer and Disney+ with Space Babies and The Devil’s Chord. Both episodes will broadcast on BBC One in the UK and Ireland on 11 May immediately before Eurovision with Space Babies at 6:20pm and The Devil’s Chord at 7:05pm. The remaining six episodes will stream on iPlayer and Disney+ at 00:00 BST and will broadcast in the evening on BBC One on the six subsequent Saturdays.