Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How  many of the  series # when the original airdate is september 25, 1967?

### Inputs:
table_name: table, columns: ['Series #', 'Season #', 'Title', 'Director', 'Writer(s)', 'Original Airdate']

### Response:
SELECT COUNT Series # FROM table WHERE Original Airdate = September 25, 1967