Question: What is the airdate when the director is George Spenton-Foster
SQL: SELECT "Airdate" FROM "1-15739098-1" WHERE "Director" = 'George Spenton-Foster';

Question: Name the msot episode that was adapted by Leon Griffiths
SQL: SELECT MAX("Episode") FROM "1-15739098-1" WHERE "Adapted by" = 'Leon Griffiths';

Question: Name the number of episodes for Alan Nourse
SQL: SELECT COUNT("Episode") FROM "1-15739098-1" WHERE "Story" = 'Alan Nourse';