(Note: The following review contains spoilers for Power of the Primes and the entire Prime Wars Trilogy)
The episode opens on the main cast, now consisting of Megatron, Windblade, Optimus Primal, Perceptor and Grimlock, inside a labyrinth on the way to the well of sparks, following the directions they received from the library of Primes. Grimlock asks, in this bottomless chasm of absolutely hilarious original comedy, if they're there yet. This wouldn't be too bad if he didn't make the same joke three separate times within a two minutes. It becomes so unlikable and unfunny, especially within that short of a time frame.
Congratulations, cartoon, you've made me dislike Grimlock.
Perceptor navigates them through the caves, and makes a comment about how if they make a wrong turn they'll be lost in the cavern for 45 Million years. Aside from the fact that, by definition, you can't calculate how long someone will be lost, I think they missed a big opportunity here:
Even with all the representation of Primus, Unicron, and the Primes in various Transformers shows and movies, we never really see what ruins and relics they left behind. This would have been a great chance to flesh the world this series has built out a bit by making the Primes a sort of Greek mythology equal. Perceptor hypes the danger of the labyrinth up so much, but in the next shot, they've discovered the well of sparks with no problem.
Instead of spending as much time in the swamp as this series did, I would have loved to have spent at least part of an episode inside this maze, with the cast dealing with whatever ancient monsters or traps might lay ahead. It would have expanded the mythos, been a cool direction for the show we haven't really seen before, and make Perceptor's hype worth while. It even had the potential to be genuinely scary. It's just sad to see that potential go to waste.
DANGER beyond your WILDEST NIGHTMARES await you. We don't have the budget to animate any of it, but TRUST US! It's there!
Like I said above, they make it to the well of sparks with little issue, but just before they make it there, Megatronus has already been successful in starting the process to bring Solus Prime back from the dead, sending out a pulse wave of energy that drains power from all cybertronians. Perceptor projects a feed of several Transformers being affected, as we get a shot of the Dinobots and Emissary, for potentially the last time.
The main cast powers through the wave and makes it to the well, just in time to catch Megatronus monologuing to the rapidly appearing form of Solus Prime. A weird thing in this scene is that the well is somehow protected from the pulse wave, as neither Megatronus or the main cast are affected as soon as they enter the chamber. It's strange that this occurs, especially since the wave originated from that room.
"So wondrous wild, the whole might seem..."
Megatron sends Windblade, Primal, and Grimlock to take down Megatronus, which they oddly do with ease, compared to the ruthless battles the two sides have had in the past. As Perceptor tries to shut down the system, Megatron catches Solus Prime up on what lengths Megatronus is going to to bring her back.
Megatronus has had enough, and throws Grimlock and Primal off of him. He traps them and Windblade in pillars of fire. He does the same for Perceptor as he walks back over to the well.
It's now just Megatron, standing alone against his name sake. Megatronus reveals, in quite a bit of hasty writing, that he has apparently been behind every major event that has happened in the entire trilogy. He made the Combiners fight one another so the enigma of combination would be brought out of it's case (although that seemed to be more of Windblade's decision if I remember correctly), and he was the one to kill Optimus Prime and extract the Matrix. Megatron tells him he can stop him because he's "Megatron. But just before the battle can begin, Rodimus enters the chamber, and evolves (for no particular reason other than "Because Unicron") into his full Rodimus Unicronus form. With that, the episode ends.
*Listens to Motorhead once*
Again, it would have been interesting to have the potential of the scene exploited a bit more, in this case to give Rodimus a genuine reason to evolve. Have Rodimus struggle with Megatronus and get thrown into the well of sparks, and have it power him up. It's just missed creative opportunities like this that drag the series down. The episode as a whole was more thrilling and engaging than the previous episode, although it lacked the cool, cinematic stills the last one had. We're getting close to the very end of this entire journey, and to see it all come together will be...interesting, to say the least.
Thanks for reading my review of episode 7! Getting remarkably close to the end now, and what a trip it's been. If you haven't seen the episode yet, you can find it on Go90. I encourage you to come back and share your thoughts in the Energon Pub forum! Was I correct? Was I totally off base? Please tell me what you thought! Thanks again! I'll see you tomorrow, where we'll have a double feature, with the review for Episode 9 in the morning, and then the review for the finale later on in the day.
*Motorhead joke stolen from Thew
* 
*joking of course*
