WHAT IS THE EPISODE NUMBER  THAT HAS 28 DVD?
CREATE TABLE "dvd_and_blu_ray_releases" (
  "release_title" text,
  "series" text,
  "no_of_dv_ds" text,
  "no_of_blu_ray_discs" text,
  "release_date" text,
  "episode_no" text,
  "region_no" real,
  "released_by" text
);
SELECT "episode_no" FROM "dvd_and_blu_ray_releases" WHERE "no_of_dv_ds"='28';