From the description on Amazon it looks like it doesn't have Spanish audio. The previous seasons do have it. I wonder if it's an error on the website. Someone here that has Season/Day 6 pop it in their player and confirm if it does have a Spanish language track please? I want to make sure it has it before I buy it.

Alright I popped in my disc 1 and it has English 5.1 Dolby digital surround AND Spanish Dolby surround as well as English, French and Spanish subtitles. I listened to it in Spanish too - it works. I hope that answers your question. I did get my season 6 set used at a closing video rental store (full set) but I'm pretty sure it's the same. And I have known Amazon to be wrong on multiple occasions, this isn't a first.

Thanks pridesticks, that's the info I needed.