Time-Traveling Romulan Assassins Target Starfleet Security Chief; Kirk and Crew Race to Protect the Timeline

La'an Noonien-Singh and James T. Kirk voyage into Earth's past to stop an assassin altering La'an's present.
La'an encounters a young Khan Noonien-Singh, her future enemy, putting her in a difficult position regarding the timeline.
By talking to a younger Captain Kirk, La'an may be influencing his future relationship with her in unforeseen ways.
The crew's actions in the past could have major consequences for the future of the series.
The fate of La'an and the timeline remains uncertain until future episodes reveal the outcomes of choices made in this episode.