Highlights of his stage career include a Scots rendition of Shakespeare's Macbeth and R.P. McMurphy in One Flew Over the Cuckoo's Nest, both directed by Robert Carlyle, who was a founder member, with Morton, of the Raindog Theatre Company in the 1990s. Morton also worked regularly with theatre companies 7:84 and Borderline, and has appeared at the Traverse, the Lyceum, the Bush, the Royal Court, in repertory all over the UK, as well as regular appearances in pantomime, notably at Glasgow's King's Theatre.