I know I've linked to it in fairly recently, but Nick's attempt to take over Gadsden's underworld began with the first mention of his name near the bottom of these pages from the middle of our 37th storyline, "Second Date." He came back into the lives of our heroes near the beginning of our 41st storyline, "Grand Opening," when Tharka made a deal with him that led to him meeting Juliette later in that same story, and the rest, as they say, is history.
One Hundred Four - The Vapors