CREATE TABLE table_9770 ("Episode #" TEXT, "Original airdate  ( UK ) " TEXT, "Episode title" TEXT, "Doctor Who episode" TEXT, "Webcast link" TEXT)

Which Doctor Who episode has a Original airdate (UK) of dvd only?
SELECT "Doctor Who episode" FROM table_9770 WHERE "Original airdate (UK)" = 'dvd only'
SELECT "Doctor Who episode" FROM "table_9770" WHERE "Original airdate (UK)" = 'dvd only'