Behind the scenes
Quark was planned to appear in Domination, a Star Trek: Deep Space Nine/Doctor Who crossover and sequel to COMIC: Assimilation². In the story, Clara Oswald would have surprised Quark with her cunning, won a bet, and earned his friendship.
- Quark at Memory Alpha, the Star Trek canon wiki
- Quark at Memory Beta, the wiki that covers all licensed Star Trek works