iTunes has had the "Complete My Album" feature for quite a while — it lets you purchase an entire album at a "pro-rated" price after buying individual tracks from it. Now Apple has the same deal for TV shows, offering a "Complete My Season Pass" option so you can purchase the remaining episodes of a full season at a discount when you already own a few. The discount is calculated by subtracting what you've already paid from the full season price, so you won't be repurchasing the episodes you already own. Completing a Season Pass should be just like buying a season pass upfront — unlocking all past and future episodes — but now you can more affordably try out a new show before committing to the entire season.