Bell made his television debut as Creet in Doctor Who's 2007 episode "Utopia", after he won the role in a Blue Peter competition.

[2] Two years later he portrayed the lead role of Connor in award winning director Chris Roche's short film Transit.

[citation needed] 2013 saw Bell portray Bain, son of Bard the Bowman, in Peter Jackson's epic adventure fantasy films The Hobbit: The Desolation of Smaug.

[15] Bell also portrayed Niki in Evergreen Production's 2015 post WWII drama The Man in the Box, though the film has yet to be released.

[18][19] In early 2022 Bell headlined the revival of Obie winner David Drake's Off-Broadway one-man show The Night Larry Kramer Kissed Me.