In 2367, J'Dan was assigned to the Federation starship USS Enterprise-D. Since he was afflicted with Ba'ltmasor Syndrome, he had to visit sickbay often to get regular treatments. While doing this, he sometimes chatted with the medical personnel, including Doctor Crusher; the medical technician assigned to him was Crewman Simon Tarses. J'Dan was played by Henry Woronicz. According to the script , J'Dan was pronounced as "j'DAN". The script's cast list and the first edition of the Star Trek: Customizable Card Game both spell his name as J'Ddan.