 Griffin's first short play, "Killjoy", was written for Theatre West Glamorgan (subsequently renamed Teatr na n'Og) and was first performed in 1993.Two more short plays, "The Change" and "A Generation Arises", were performed in 1994.In 1997, Griffin collaborated with Jo Brand on a short play, "Mental", which was based on their shared experiences as psychiatric nurses; the two performed an updated version at the 2003 Edinburgh Festival Fringe.