[4] In 2008, Howell appeared in the Primavera production of Jingo: A Farce of War by Charles Wood at London's Finborough Theatre,[5] then toured with the Peter Hall company in an adaptation of Henry James's Portrait of a Lady and Ibsen's A Doll's House.
[6][7] Two years later he played Trigorin in a new adaptation of Chekhov's The Seagull by Evening Standard Award winning writer, Anya Reiss at the Southwark Playhouse.
He also voices Victor Belmont in the 2014 video game Castlevania: Lords of Shadow 2, as well as providing the motion capture for the protagonist, Dracula.
He also provided the voice and motion capture for Weyland-Yutani employee Christopher Samuels in the 2014 survival horror game, Alien: Isolation.
In the summer seasons of 2014 and 2015 he appeared on the stage of the Globe in London, in 2014 as Cassius in Shakespeare's Julius Caesar and in 2015 as Bishop Santa Cruz in Helen Edmundson's The Heresy of Love.