A Trill Joining candidate comes aboard the station, and Dax has to decide if he's cut out for a symbiont.
- Ace Pilot: Arjin. A level 5 pilot to be precise, which comes in handy for flying through the wormhole without hitting any verteron nodes.
- Actual Pacifist: Kira argues in favor of destroying the proto-universe by saying it's no different than stepping on ants. Odo replies that he doesn't step on ants.
- Actually Pretty Funny: When Quark tells O'Brien that Kira insists on fighting her latent attraction to him, O'Brien actually chuckles.
- Dating What Daddy Hates: Well, "hates" might be a little strong, but Sisko isn't happy about Jake being in love with a dabo girl.
- Don't Call Me "Sir": Jadzia doesn't want Arjin to call her "Ma'am" or "Lieutenant", preferring First-Name Basis.
- The Dreaded: No Trill initiate wants to be assigned Dax as a field docent because of the large number of candidates previous Dax hosts have rejected (especially Curzon, whom Jadzia has less-than-fond memories of).
- Drowning My Sorrows: Arjin parks himself in Quark's bar, convinced that he's torpedoed any chance of getting a good recommendation.
- From Bad to Worse: Implied re the voles — apparently, their mating season is coming up.
- I Hate Past Me: Of an Nth Doctor variety; Jadzia was on the receiving end of Curzon Dax's borderline-abusive training prior to becoming joined to the Dax symbiont herself and wants as little to do with that style of training as possible.
- Ms. Fanservice: Jadzia wearing only a Modesty Towel.
- My Sister Is Off-Limits!: How Quark screwed up his chances of being more than a bartender."Rule of Acquisition 112: Never have sex with the boss's sister."
- Not So Different: In his Captain's Log, Sisko wonders if destroying the mini-universe would make him no different from the Borg.
- The Unfavorite: Arjin's sister, who disappointed their father by declining to be joined.
- "Well Done, Son!" Guy: Arjin seems mostly in the Host Program because it's what his father wanted.
- Year Inside, Hour Outside: Kira is dubious that life could exist in the proto-universe after just hours. Bashir points out that they have no idea how time works in this other dimension and that a few hours for them could be billions of years passing inside the proto-universe.