Prior to graduation, McGuire had been a member of Playbox Theatre Company, and was involved in minor radio dramas and Shakespearean productions. While still a drama student, he first came to attention or his role in the premiere of Laura Wade's satirical play Posh in which he portrayed a student member of the "Riot Club", a parody of the Bullingdon Club at Oxford University.
Grace Under Pressure
As Jean-Paul Goude
My Mother’s Wedding
Fisherman's Friends: One and All
As Gareth
Saltburn
As Henry
Mr. Turner
As John Ruskin
Paranormal Investigators
As Terry
Sweet Sue
As Soho Punter
Get Santa
As Tony
About Time
As Rory
Blitz
As Clive
National Theatre Live: Rosencrantz & Guildenstern Are Dead
As Guildenstern
Old Boys
As Huggins
Artemis Fowl
As Briar Cudgeon
Bees Make Honey
As Mr. Conick
Regardez
As Tony
The Happy Prince
As Ambrose Smithers - Undergraduate #1
The Duke
As Eric Crowther
National Theatre Live: I'm Not Running
As Sandy Mynott
Mine
As Liam
All My Friends Hate Me
As George
Cinderella
As Palace Official
Boys On Film 20: Heaven Can Wait
As Liam (segment "Mine")
Love, Nina
As Nunney
Lovesick
As Angus Baker
Cheaters
As Josh
Anatomy of a Scandal
As Chris Clarke
The Man Who Fell to Earth
As Zach
The Gentlemen
As Pete Forbes Spencer
The Graham Norton Show
As Self
Misfits
As Ollie
A Young Doctor's Notebook
As Even Younger Doctor
Industry
As Michael Walker