Stardate not given: A Trill
candidate for joining with a symbiont arrives on DS9 for observation by Dax, who will report his psychological
fitness to the Symbiosis Commission on the Trill
homeworld. In the course of their bumpy relationship
- based on the fact that the candidate prepared
himself to be in the company of Curzon Dax and not
Jadzia - they pick up something unusual from the
wormhole and bring it back to the station for study,
not realizing that it will begin expanding rapidly
until it threatens to consume the station...and the
space beyond.