Spoilers for Episode 3.11 "Mystery Spot" (CW-US)

[Vilandra]

Episode 3.13: Mystery Spot (unconfirmed title) [We are not sure this episode was completed before production shut down due to the strike]
Airdate: 2008

12/13 - Eric Kripe reveals: We also have a great Groundhog day episode coming up. Sam basically wakes up every day and it's the same day and Dean dies at the end of every single day. It's actually quite funny. Dean dies maybe 10 different ways on camera, and off camera, maybe he dies 200 different ways. Sam doesn't go through just three or four Tuesdays, he goes through something like 150 Tuesdays. Source: TV Guide Online


Source: SpoilerFix (http://www.spoilerfix.com/supernatural.php)

[Velvet Sky]

01/29 - Eric Kripe reveals: 'Mystery Spot' is a Groundhog's Day episode where Sam keeps reliving the same Tuesday over and over and over again, and at the end of every Tuesday Dean dies. And no matter what, it's actually a pretty funny episode. We killed Dean in every conceivable way. He gets electrocuted, he gets botulism, he's hit by a car, he's crushed by a desk, you know he's shot a couple of times, he's hit with an arrow. It's a totally fun episode. It's actually kind of meaningful, and we play - I think it hits what Supernatural does best, it's funny one moment and emotional the next. This obviously freaks the hell out of Sam, having to watch Dean die over and over again. Source: Kristin on E!Online
01/28 - Sam and Dean investigate the disappearance of a man who went missing at a tourist location. While searching the site, Dean is shot and killed by the owner. Sam is devastated but stunned when he wakes up the next morning to find Dean alive and well. As the day unfolds, Sam realizes he is re-living the previous day and tries to prevent Dean's death, but to no avail. Dean dies again and Sam must learn to live life without his brother by his side. Source: The CW

Source: Spoilerfix.com (http://www.spoilerfix.com/supernatural.php)