Kid: Are you the son of Mogh?
Kid: Is it true that you can kill someone just by looking at him?
Worf: Only when I am angry.
On board the Defiant
, the DS9 crew find a planet with a strange energy barrier. They manage to penetrate it and find a settlement of several thousand people who claim to be their descendants. They are told that when they try to escape the energy barrier to leave, they will be thrown two hundred years into the past and the Defiant
will crash. Sisko is forced into a difficult choice; if they succeed in escaping, all these thousands of people will be wiped from existence; but if they do not, they will never see their homes or families again.
This episode contains examples of
- Always Save the Girl: The future Odo changes the Defiant's course heading at the last minute, which saves Kira's life at the cost of erasing the entire settlement.
- Love Confession: Once the Defiant arrives at the planet, a 200-years-older Odo wastes no time in beaming up to the Defiant and making one of these to Kira.
Odo: I love you, Nerys. I've always loved you.
- My Greatest Failure: According to Yedrin, the Defiant becoming trapped in the past was this for Jadzia.
"Because of me, Kira died, and 48 people were stranded here. You don't know what it was like to live with that. For years, Benjamin, every time I looked at you, all I could think about was Jake and how, because of me, he would never see his father again. Eventually, I had to accept the fact there was nothing I could do to change things; I couldn't bring Kira back. All I could do was look to the future, Benjamin, and make sure that we survived here—no matter what."
- The Needs of the Many: Examined from several different perspectives.
- Nice Job Breaking It, Hero: Jadzia admits she was in such a rush to make a discovery that she didn't properly scan the barrier surrounding the planet.
- Proud Warrior Race: More like Proud Warrior Philosophy. Worf's descendants have split off from the main colony to live a more martial lifestyle in keeping with Klingon traditions of honor and courage, but humans can also join (and have) if they prove themselves worthy. They all call themselves "the Sons of Mogh."
- Sadistic Choice: The crew can use their future knowledge to save themselves and Kira, but if they do, they'll erase the 8,000 settlers on Gaia.
- Set Right What Once Went Wrong: The entire episode involves the crew deciding whether or not to do this: Do they use their new-found knowledge of the future to avoid the temporal barrier and save Kira, or do they follow the same course of events as before, crash-land on the planet, and save the existence of their descendants living on Gaia? In the end, the crew decides to do the latter, but the 200-years-older Odo, who can't bear the thought of losing Kira again, changes the course heading at the last minute so the Defiant misses the temporal barrier, effectively setting right what once went wrong.
- Shrouded in Myth: Worf to the crew's descendants.
Gabriel: Are you the son of Mogh?
Worf: Yes, I am.
Gabriel: Is it true you can kill someone just by looking at them?
Worf: Only when I am angry.
- As is Bashir, who delights in his own fame.
- What the Hell, Hero?: Kira lays a huge one on Odo when she finds out Alternate!Odo sabotaged the plan to crash the Defiant so Kira could live at the expense of 8000 colonists.
Kira: 8000 people! That makes it right?!
Odo: I don't know. He thought so.
- You Can't Fight Fate: Kira strongly believes this. So much so that when a plan to "split" the Defiant crew into two seems like a "cheat". She's almost relieved that the plan is false, and decides she'd rather die that erase 8000 colonists from existence.