Supernatural is gearing up to air its 300th episode, reinforcing the suspicion that this show will outlive all of us.

When TV Guide spoke to the cast on the red carpet for the 300th episode celebration, the stars were naturally very tight-lipped about the landmark episode, but we did get a few clues about how it's all going to go down from Jensen Ackles and Jared Padalecki.

"There have been some rewrites," Ackles told TV Guide. "The first pass was great, and there were some folks — the guys that make way bigger decisions than me — who were like, 'I think we need to punch it up a bit.' So they went back and revamped, and I think it's going to be pretty epic."

Padalecki sympathized with the conundrum of writing an episode worthy of this anniversary, saying, "I feel for the writers because they have to decide if they're going to go crazy meta, just a true shout-out to the fans like Episode 200, or if they're going to make it an episode that still progresses the storyline or some mixture of the two. It's a daunting task, no doubt."

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We now know that Sam and Dean's father, John Winchester (Jeffrey Dean Morgan) will make a one-time appearance in Episode 300, thanks to some sort of wish-granting scenario instigated by Dean. The elder Winchester won't be the only one to get closure from his late father's visit though. Padalecki told TV Guide that this episode will be very cathartic for Sam, who always had a turbulent relationship with his father.

"There's some scenes that also make it come full circle," Padalecki said. "For Sam specifically... we see [him] get some reconciliation that he hasn't really had, he's been desiring. He didn't even know he was really looking for this. We see him tie up some loose ends and really make the most of his situation, and it's a pretty awesome situation."

If you remember way back to Season 2, John Winchester died making a deal with the yellow-eyed demon to save Dean's life, and while we briefly saw his ghost again in the Season 2 finale, John Winchester has been M.I.A. for over a decade now on this show. Now that he's back, it's safe to say that both boys will finally get to address some long-standing issues they had with their father and the way he died.

Supernatural's 300th episode airs Thursday, Feb. 7 at 8/7c on The CW.

(Full disclosure: TV Guide is owned by CBS, one of The CW's parent companies.)

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