Where do I even START on this episode.....Well, I should start by saying that it is amazing and easily makes top five OV episodes for me. It is seriously one of the best episodes of the franchise. The animation is extremely well done and fluid, the dialogue has shed off a lot of the stiffness and dullnesss usually found in a Ben 10 episode, all the gags were funny (AND THERE WERE SO MANY OF THEM). It was a fantastic episode even ignoring the aliens, all of which (save for Big Chill) really needed the screentime. Upgrade, Rath, Frankenstrike, Eye Guy, Toepick....this is the king's haul of sexy ass aliens.
BUT WAIT, THERE'S MORE
Halfway through the episode, what I'm pretty sure was a fucking ALTERNATE BEN shows up, and GOD DAMN. IF they keep including stuff like this in shadowy places throughout the arc, the finale for this arc will be so much sweeter. Just. So amazing.
AND MORE STILL
One of the aliens in Plumbers HQ that got zombiefied was a Merlinisapiens. Just. Holy shit guys. It's a Merlinisapiens. Holy shit.
This episode had everything.