Which X-Men '97 season 2 episode was written by Brian Ford Sullivan?

The X-Men '97 season 2 episode written by Brian Ford Sullivan is “Days of Past Future.”

“Days of Past Future” is the season's premiere episode and follows Forge and Bishop as they attempt to rescue the X-Men after the team is scattered across different eras. Its story immediately establishes season 2's central time-travel structure, moving between the present, the distant past, and a far-future conflict involving Apocalypse.

The title deliberately recalls “Days of Future Past,” one of the most famous X-Men comic storylines. That 1981 story by Chris Claremont and John Byrne centers on a dystopian future ruled by Sentinels and a mission to alter history. X-Men '97 reverses the phrase and uses its own title for a new story about time displacement, Cable, Forge, Bishop, and the X-Men's fractured timeline.

The other listed choices are different season 2 episode titles. “Survival of the Fittest” is the finale, while “The Dead Man's Hand” and “Danger.exe” refer to other episodes in the season. The answer is therefore a single identifiable episode, not a general writing credit shared across several options.