Which Doctor Who episode has a Original airdate (UK) of dvd only?
CREATE TABLE table_name_51 (doctor_who_episode VARCHAR, original_airdate__uk_ VARCHAR)
SELECT doctor_who_episode FROM table_name_51 WHERE original_airdate__uk_ = "dvd only"
### Context: CREATE TABLE table_name_51 (doctor_who_episode VARCHAR, original_airdate__uk_ VARCHAR) ### Question: Which Doctor Who episode has a Original airdate (UK) of dvd only? ### Answer: SELECT doctor_who_episode FROM table_name_51 WHERE original_airdate__uk_ = "dvd only"