Mikey stared wide-eyed at the airship coming through the portal. “Holy giant floating shippy-ship!” he screamed. “Leo! Do the zippy-zappy thing! Now!”

Quickly, Leo lifted the Micro-fission Omni-disintegrator and put the portal generator right in its cross hairs. The weird-looking weapon had served him well tonight. Hopefully it had enough juice to finish the job!

“Say good night, Kraang!” Leo said confidently.

Thinking he was about to end the Kraang invasion with one shot, Leo happily squeezed the trigger. But nothing happened! Only a sputter of sparks came out before the battery died for good. The weapon was toast.

“What the heck happened?” Donnie asked.

“I think the battery died!” Leo answered.

“And we’ll be joining it unless someone thinks of something,” Raph added.

“What’s Plan C, Leo?” Donnie asked in a panicked voice.

With a crazy look in his eye, Leo asked, “Donnie, what would happen if we ruptured the power cell?”

“The whole place would go up, with you in it!” Donnie warned. He looked at his brother’s serious face. “Whoa, Leo. You’re not thinking what I think you’re thinking!”

But he was. And there was no way anyone was going to talk him out of it. “Everybody get out of here!” Leo said sternly.

“He’s thinking it!” Donnie said, backing away.

Donnie, Raph, and Mikey took off toward the roof, heading for safety. They all knew what was about to happen.

Leo drew his trusty katana blades and visualized his route to the power cell. He could see the crowds of Kraang-droids in his way, but he wasn’t going to let them stop him. He summoned his courage. It was now or never. So he flew into action!

Leo evaded the first wave of Kraang-droids with a series of flips and somersaults. As he broke through untouched, a second wave of armed droids stormed him, and Leo unleashed a fury of katana strikes.

He sliced and diced his way through the Kraang, leaving a mass of blown circuits and broken robot parts behind him. He sprinted toward the power cell. He was getting closer.

But so was the Technodrome.

Just as the mechanical monstrosity was about to fully materialize through the portal, Leo went airborne. With one final push, he front-flipped, plunging his katanas into the power cell with a fierce downward thrust! A nest of sparks ignited. A devastating energy wave was about to blow this building, and everything in it, sky-high.

Leo spun around. He needed to get out of there. He ran for the roof, when—KABOOOOM!—the power cell erupted in an off-the-charts explosion. In an instant, glowing flames consumed everything in a white-hot cloud. The shock wave blew Leo off the side of the T.C.R.I. building before it burst into smithereens.

Leo was in midair and falling fast.