Introduced in "X-Men", Scott Summers is a central character to the X-Men film series.
History
Childhood and Discovery
X-Men Origins: Wolverine
X-Men
X2: X-Men United
X-Men: The Last Stand
X-Men: Days of Future Past
When Logan was sent back to prevent the creation of the Sentinels, he succeeded in changing the timeline. In the new future, Scott is alive, the events that lead to his death never having happened, and remains in a relationship with Jean Grey.