user: Question: In which series was season 18?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'real']
Sample row: [97.0, 1.0, '"Hell Toupee"', 'John Tracy', 'Regina Stewart', 'September 24, 1993', 455351.0]
SQL:

assistant: SELECT "No. in series" FROM "Table" WHERE "No. in season" = 18.0;