A group of alien visitors attempt to violently seize Lieutenant Commander Dax and abduct her from the station. Once captured, they announce they are enacting a sanctioned extradition to take Dax back to their planet on a charge of murder. There's only one problem: the accused is former host Curzon Dax, and it is up to a Bajoran magistrate to decide whether one host can be tried for the crimes of another.
"Dax" (imaginative title there, guys) is one of those episodes where you can see the reasoning behind it, and you can see why the creatives thought it would make for an engaging hour of television, yet it's painfully obvious why it was never going to work. Jadzia Dax is a fascinating character with enormous scope for science fiction drama, and I imagine the writers were keen to start exploring her potential as soon as possible. At the same time a courtroom drama is an inexpensive format that could save money likely spent on the pilot, and can generate great character-based drama through dialogue and passioned debate. After all, this entire approach worked wonders for Commander Data in The Next Generation's "The Measure of a Man"; why not here as well?