TNT has announced that they will be running a marathon of Supernatural episodes in the run up to episode 300.
 
 
Starting Monday, Feb. 4, you'll be able to revisit golden oldies like "Slash Fiction," in which killer clones turned Sam (Jared Padalecki) and Dean (Jensen Ackles) into wanted men, and "Mystery Spot," which found Sam reliving Dean's death over and over again thanks to the Trickster (Richard Speight Jr.).
 
Here's the schedule
 

Monday, Feb. 4
10 am ET: "Various & Sundry Villains"
11 am ET: "Devil's Bargain"
12 pm ET: "ScoobyNatural"
1 pm ET: "Tall Tales"
2 pm ET: "Mystery Spot"

Tuesday, Feb. 5
2 am ET: "Sex and Violence"
3 am ET: "Monster at the End of This Book"
4 am ET: "Good God, Y'all"
5 am ET: "Dead Men Don't Wear Plaid"
10 am ET: "Exile on Main Street"
11 am ET: "Two and a Half Men"
12 pm ET: "You Can't Handle the Truth"
1 pm ET: "Family Matters"
2 pm ET: "Clap Your Hands if you Believe"

Wednesday, Feb. 6
10 am ET: "Hello, Cruel World"
11 am ET: "Defending Your Life"
12 am ET: "Slash Fiction"
1 pm ET: "The Mentalists"
2 pm ET: "What's up, Tiger Mommy?"
3 pm ET: "Remember the Titans"
4 pm ET: "The Great Escapists"

Thursday, Feb. 7
10 am ET: "Clip Show"
11 am ET: "Sacrifice"
12 pm ET: "The Things We Left Behind"
1 pm ET: "Inside Man"

 
So catch some of the best episodes of Supernatural before you see the episode 300