Tora Ziyal was first introduced in the Season 4 Star Trek: Deep Space Nineepisode "Indiscretion". In this episode, Gul Dukat accompanies Kira Nerys to the crash site of the Cardassian prison transport "Ravinok". On the crash site (in the Dozaria system) Kira finds out Dukat went along because his mistress (Tora Naprem) was aboard the Ravinok. They find the grave of Tora Naprem, but Dukat confesses Tora Naprem and he had a daughter, Tora Ziyal, who was also on the transport. They find Ziyal in a Breen prison camp on the planet and free her.
After living on Cardassia for a short time, Ziyal moves to DS9. She lives there until she is killed by Gul Dukat's first officer Damar, because she confessed to freeing Rom, Kira, Jake and Leeta from prison (Season 6 episode "Sacrifice of Angels").
She was portrayed by three actresses: Cyia Batten, Tracy Middendorf, and Melanie Smith.
ToraZiyal was born in 2353, the illegitimate daughter of GulDukat by one of his Bajoran mistresses, Tora Naprem.
Ziyal spent the next six years enslaved in a Breen mine, until she was found there by her father and Kira.
Ziyal was evacuated to Bajor in "Call to Arms", and attended art school at a Bajoran university, until she finally reconciled with her father and returned to the station ("Sons and Daughters").