"A scientist discovers a pocket watch that allows her to time-travel, but when her actions in the past have unintended consequences, she must confront her own doubts and fears, ultimately realizing the true power of time-travel and working with her future self to create a better future."
Protagonist: A scientist who seeks to unravel the mysteries of time-travel and its implications; Antagonist: A skeptic who wants to suppress the discovery of time-travel to maintain the status quo.
The protagonist successfully travels back in time and witnesses a historical event, only to realize that her actions in the past have unintended consequences in the present.
The protagonist, after witnessing the unintended consequences of her actions in the past, decides to destroy the pocket watch to prevent any further disruptions to the timeline. She then devotes herself to finding a way to repair the damage caused by her time-travel, ultimately realizing that the true power of time-travel lies in using it to create a better future, rather than altering the past.
Twist: The protagonist discovers that the antagonist is actually a future version of herself, who traveled back in time to stop her from altering the past and causing further damage to the timeline. This revelation forces the protagonist to confront her own doubts and fears, ultimately leading to a resolution that involves both versions of herself working together to harness the power of time-travel for the greater good.