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
Jean-Paul Goude
My Mother's Wedding
Jeremy
Fisherman's Friends: One and All
Gareth
Saltburn
Henry
Mr. Turner
John Ruskin
Paranormal Investigators
Terry
Sweet Sue
Soho Punter
Get Santa
Tony
About Time
Rory
Blitz
Clive
National Theatre Live: Rosencrantz & Guildenstern Are Dead
Guildenstern
Old Boys
Huggins
Artemis Fowl
Briar Cudgeon
Bees Make Honey
Mr. Conick
Regardez
Tony
The Happy Prince
Ambrose Smithers - Undergraduate #1
The Duke
Eric Crowther
National Theatre Live: I'm Not Running
Sandy Mynott
Mine
Liam
All My Friends Hate Me
George
Cinderella
Palace Official
Boys On Film 20: Heaven Can Wait
Liam (segment "Mine")