In 2370, Proka and Rugal visited Deep Space 9 when he was accused by Zolan of mistreating Rugal because he was Cardassian. Commander Benjamin Sisko ordered Rugal be temporarily removed from the Proka family while the investigation took place. After it was revealed that Rugal's father was still alive, a custody hearing was held. Proka lost, and it was decided that Rugal would return to Cardassia with his biological father, Kotan Pa'Dar, after it was discovered that Dukat had deliberately left the boy behind and told his father that he was dead, in order to embarrass his rival at a later date. (DS9 episode: "Cardassians")
- ST - Terok Nor novel: Day of the Vipers
- DS9 episode: "Cardassians"
- DS9 novel: The Never-Ending Sacrifice