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

### Instruction:
Which number episode of season 6 was the title "Sight Unseen"?

### Inputs:
table_name: table, columns: ['No. in season', 'No. disc', 'Title', 'Directed by', 'Written by', 'Original air date']

### Response:
SELECT MIN No. in season FROM table WHERE Title = "Sight Unseen"