This was one of the best epiodes so far in this series hands down.
The fighting was great, April meditating with Splinter, Newtralizer (Can't wait to hear him speak!), Kirby was rescused (or so we think!), Shredder & the Kraang now working together!, April being able to find the Kraang device (which looks like the Turnstone from the Archie series and I still think she is some sort of robot), I seriously thought April was going to find the Ratking after we saw that rat in the sewer.
Oh and I liked Mikey's bad driving and the Kraang calling the other an idiot.
The only thing I thought we'd see that we didn't was Tim in Don's lab.