For those of you worried about this season being the last, fear not. The CW has picked up Supernatural for an eighth season. Which means that as we barrel down the final stretch of episodes, it's probably safe to say a gigantic cliffhanger is on the way.

But what is everything leading up to?

For a good majority of the season, the main villain, the Leviathan, have slimed their way to the background while trying to carry out their devious fast food plan to eat the human race. They've been plotting and excavating and copying famous celebrities, but because Sam and Dean have had no idea how to kill the creatures from Purgatory, they've pretty much just left them alone. Or tried to avoid them.

Except "Reading is Fundamental" really focused on the core mythology of the Leviathan arc and packed so much information in that I'll probably need to play a few rounds of Sorry! before I fully process it all.

The key to the home stretch involves Dick Roman's red clay tablet the brothers stole last episode. Turns out God had a soft spot for diary writing and using his scribe Metatron, crafted the aptly named "Word of God." Guess God decided to have a backup plan in case somebody wanted to let the Leviathan loose.

It makes sense for the Winchesters to retrieve the tablet as it finally helps their cause for victory, but why would Dick Roman want it? Does it do more than explain how to defeat them?

Clearly there's a deep seated power beyond simple sentences. After all, women all over seemed to give birth and it even awoke the catatonic Castiel. But what benefit would the Leviathan gain, especially in trying to eat everyone?

Once again, I'm pleased to see Misha Collins back, even if he plays a more insane version of his angel character. Castiel's non stop gibberish about cat's penises and the path of bees is but a small sample of the broken angel. While he seems rather content and spends a lot of his time smiling and acting extremely childlike (even more so than usual,) there's a sad recognition of the pain and suffering he's bestowed upon himself.

Castiel wants to atone for his actions and if eliminating the sanity he once had for this simpler version, he would gladly take the punishment.

It's funny that as viewers, we both got Bobby and Castiel back on the show, but they aren't the same people we once knew. The former is a haunted mess and the latter signing up for his role in "Angel, Interrupted". I wonder what their final end game will be.

It seems pretty obvious that on some level, the end game for the season will certainly include the crashing of entities from the angels, demons, Leviathan, and of course, world saving heroes, Sam and Dean.

And I love that that biblical feel returned while again bringing things back to the past with the renewed focus on angels and demons. They may have been pushed out of the way for the black oozed Leviathan, but I have a feeling they will be making their comeback tour pretty soon.

After all, Meg's comments about Crowley being the main focus was a rather interesting point and potential lead in to next season. Dean may have scoffed at the idea with his more pressing matters, but the King of Hell should never be counted out. Especially when Mark Sheppard portrays him wonderfully.

So while his evil presence might be a future cause (at least for Sam and Dean for now) the brothers finally know how to kill the Leviathan. Finally! All you need is your typical righteous mortal bone washed in the blood of the three fallen. Available at your local Wal-Mart obviously. With Castiel offering up the first part, the question remains: who and where are the other two?

Yet, the episode refused to stop there giving (for me at least) a reason to like and even fear the Leviathan. It's no secret that I've found them rather bland, but Edgar shoving his hands inside the angels and proving their powerlessness was kind of cool. I always thought the winged ones had the upper hand, but it looks as though even they are useless when it comes to Leviathan. Uh oh, Kevin. Looks like you've got a new babysitter to deal with now and he's not really a nice guy.

Supernatural really stepped it up in terms of story, pushing things dramatically forward while giving time for a few more emotional moments with Castiel. I love that things feel like they are coming to a head and hopefully that driving force powers through to the end.

Sean McKenna was a TV Fanatic Staff Writer. He retired in May of 2017. Follow him on Twitter.