Table: tv_episode_data_19
Columns: no_in_series
no_in_season
title
directed_by
written_by
original_air_date
production_code
u_s_viewers_millions

Question: How many were the US viewers (in millions) of the episode that was written by Gordon C. Lonsdale?
SQL: SELECT "u_s_viewers_millions" FROM tv_episode_data_19 WHERE "directed_by" = 'Gordon C. Lonsdale'

Question: What was the air date of the episode that has a production code of 5aky13?
SQL: SELECT "original_air_date" FROM tv_episode_data_19 WHERE "production_code" = '5AKY13'

Question: Who was the writer of the episode with a production code of 5aky04?
SQL: SELECT "written_by" FROM tv_episode_data_19 WHERE "production_code" = '5AKY04'