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

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'