Ennis began his comic-writing career in 1989 with the series Troubled Souls. Appearing in the short-lived but critically-acclaimed British anthology Crisis and illustrated by McCrea, it told the story of a young, apolitical Protestant man caught up by fate in the violence of the Irish 'Troubles'. It spawned a sequel, For a Few Troubles More, a broad Belfast-based comedy featuring two supporting characters from Troubled Souls, Dougie and Ivor, who would later get their own American comics series, Dicks, from Caliber in 1997, and several follow-ups from Avatar.

Another series for Crisis was True Faith, a religious satire inspired by his schooldays, this time drawn by Warren Pleece. Ennis shortly after began to write for Crisis' parent publicat