Real World article
(written from a Production point of view)

Instances on Star Trek: Deep Space Nine of a main character listed in the opening credits not appearing in the episode.

Avery Brooks Edit

Nana Visitor Edit

Rene Auberjonois Edit

Michael Dorn Edit

Michael Dorn was not a cast member for seasons 1-3.

Terry Farrell Edit

Terry Farrell was not a cast member for season 7.

Alexander Siddig Edit

Colm Meaney Edit

Nicole de Boer Edit

Nicole de Boer was not a cast member for seasons 1-6.

Armin Shimerman Edit

Cirroc Lofton Edit

Cirroc Lofton was the only main cast member in any Star Trek series to date to be absent for more episodes than he appeared.