Table: out_of_the_unknown
Columns: episode
title
story
adapted_by
director
airdate
exists

Question: What is the airdate when the director is george spenton-foster
SQL: SELECT "airdate" FROM out_of_the_unknown WHERE "director" = 'George Spenton-Foster'

Question: Name the msot episode that was adapted by leon griffiths
SQL: SELECT MAX("episode") FROM out_of_the_unknown WHERE "adapted_by" = 'Leon Griffiths'

Question: Name the number of episodes for alan nourse
SQL: SELECT COUNT("episode") FROM out_of_the_unknown WHERE "story" = 'Alan Nourse'