#summary

In the previous arcs we see recordings of Donnie's final hours infiltrating the Technodrome. He is forced to cut off Leo's arm to save him from becoming infested by the Krang (and more importantly to keep the bomb planted in his head from going off, a safeguard so his memories can't be read by the Krang).

While the others escape Donnie stays behind against Leo's orders and manages to plant two pieces of purple-looking krang tech within the Technodrome. One appears to a probe which allow Shelldon to tap into the Krang mainframe and secretly spy on them. The other... we don't know. Captured and confronted by Krang Prime, Donnie choses to trigger the bomb in his own head so that his knowledge cannot be used by the Krang.

Omega decides to reveal what he can to April, explaining that the two pieces are part of a secret plan of Donnie's known as "Project Shield and Spear." Both are pieces of new hybrid krang tech he created using krang matter and Draxum's bioengineering. "Shield" is the probe they all knew about, but what "Spear" does he refuses to say. Whatever it is, he says it will only act as a last resort should the Krang win the war and will guarantee that they never attack another planet... and Omega is the only one who can pull the trigger.

Elsewhere, while Mikey had managed to awaken some of his old power within him, it feels like his Ninpo is not back to normal. He can do things he couldn't do before, like healing magic, but it all makes him very tired. Draxum explains that it's likely because he hasn't completely unlocked his ninpo and is using up his life force instead. Mikey decides to attempt to unlock his ninpo by using the powers he currently has.

He nearly achieves this but comes across another being that also seems to be reaching for the ninpo. Instead he chases after the voices he hears which sounds like Donnie's and is exposed to flashes of the new timeline created in the movie.

Back in the real world, it's not looking good as Mikey suddenly bursts with a rush of intense energy. He loses consciousness but gains a painful new hairdo.

While this is happening, Omega accidentally comes upon the coordinates where it seems Raph's body might have fallen in the Central Park Colony ruins. We end the arc with two familiar looking agents being sent out into the field to find and retrieve him...