Cast & creator
Kai Alexander
Best known for EastEnders, Masters of the Air, Masters of the Air
Kai Alexander is an actor, known for his role as Sgt. William Quinn in the miniseries Masters of the Air (2024) from Steven Spielberg, Tom Hanks and Gary Goetzman. He began his career with roles in award winning comedy series Catastrophe (2015) and the Harlan Coben thriller The Stranger (2020). He later went on to portray Richard Branson in Danny Boyle's Pistol (2022). In 2025 Alexander played Lyle Jennings in the Scott Frank helmed series Dept. Q (2025). He will next be seen in Anxious People (2026) alongside Angelina Jolie and Jason Segel, directed by Marc Forster.
3
film credits
7
television credits
10
1985–2026 · acting roles
7.1
average across scored titles
Signature credits
Known for
Across film & television
Filmography (10)
Showing 10 of 10 credits
EastEnders
Male Interviewee
1985
Masters of the Air
Sgt. William Quinn
2024Masters of the Air
2024
Dept. Q
Teenage Lyle
2025
The Stranger
Dante Gunnarsson
2020
Pistol
Richard Branson
2022Original Drama Shorts
William
2014Anxious People
2026Angels in the Asylum
Jack
Wind of Change
Fautisch Drummer