A more difficult task was the return of Cyclops and Jean Grey. In 1980, Jean Grey was killed during the seminal "Dark Phoenix Saga", and since it was considered vital that the team have a female member, Layton opted to use fellow mutant Dazzler. Publicity material for the series began to appear at this time, with images of the team using a blank space or silhouette in place of the female member as a teaser mystery. However, writer Kurt Busiek suggested a way to add Jean Grey to the roster that became one of the most significant cases of retroactive continuity in comic book history: Jean Grey had never actually been the Phoenix. Instead, the Phoenix entity copied Grey's identity and form, keeping her safe in a cocoon-like structure beneath Jamaica Bay. Busiek related the idea to Roger Stern, who related it to John Byrne. Byrne wrote and illustrated "Fantastic Four" #286 (1985), incorporating Busiek's idea. Several panels of this comic were rewritten (by X-Men writer Chris Claremont) and redrawn (by initial X-Factor artist Jackson Guice) to depict the Phoenix entity as less malevolent than Byrne intended.