user: Question: Name the msot episode that was adapted by Leon Griffiths
Columns: ['Episode', 'Title', 'Story', 'Adapted by', 'Director', 'Airdate', 'Exists?']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [101.0, '“No Place Like Earth”', 'John Wyndham', 'Stanley Miller', 'Peter Potter', '4 October 1965', 'Yes']
SQL:

assistant: SELECT MAX("Episode") FROM "Table" WHERE "Adapted by" = 'Leon Griffiths';