user: Question: When 129 is the number in the series who is the writer?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [111.0, 1.0, '"Legacy (Part 1)"', "Terrence O'Hara", 'Ed Zuckerman & Paul Levine', 'October 3, 2000']
SQL:

assistant: SELECT "Written by" FROM "Table" WHERE "No. in series" = 129.0;