Sean performed in "The Black Album" at the Cottelsloe Theatre/National Theatre in London, South Bank and started a national UK tour with the cast throughout the UK in October/November 2009.
He also voiced one of the characters in "The Happy Prince," a stop-animation film, produced by Skatedog Films Ltd and directed by John Horabin in 2009. This adaptation of the classic Oscar Wilde short story was featured at the BFI in London in Autumn 2009.
In late summer 2006 Gallagher signed up with Coronation Street to play the part of Paul Connor, one of two brothers buying a share in Underworld, the local knicker factory.
In June 2007, Gallagher left the ITV soap to pursue other projects.
On , it was announced that Gallagher was cast for the lead role of Mal Faith in a new ITV drama series, Rock Rivals, produced by Shed Productions. He starred alongside former EastEnders actress Michelle Collins, who played his wife, Karina Faith.
He appeared in a production of Mary Stuart for the Traverse Theatre, Edinburgh with David Oakes and Penny Layden.
Sean was to play the character Frank Gallagher in the Channel 4 drama Shameless. The scenes including Sean as Frank, however, were re-shot at the cost of £100,000, because it was thought that he was too young to play the role. The part was given to David Threlfall.
Gallagher worked at Stanley's Casino in Luton and honed his skills as a croupier to help pay his drama school tuition.
- Internet Movie Database at the