The Turtles drove the Shellraiser out of the sewers and through the city at top speed. They knew exactly where to find the Kraang: their secret headquarters, located on the top floor of the Techno Cosmic Research Institute. That building, once a top-secret science facility for the U.S. government, was now a gateway to another dimension . . . Dimension X!

“All right, guys, we’re going to keep it simple,” Leo told his brothers. He gestured to a strange-looking device that Donnie had stowed inside the Shellraiser. “We go to T.C.R.I., and we use the Micro-fission Omni-disintegrator, which Donnie calculates is powerful enough to destroy the portal with a single shot.”

“Then why didn’t we use it last time?” Mikey asked.

“Because we didn’t have it last time,” Donnie explained.

They’d only been in the Shellraiser a few minutes, but Mikey and Donnie had already had enough of each other. Maybe it was the pressure of having to save the entire world. Or maybe it was April’s kiss.

Mikey muttered, “You have an answer for everything, don’t you, Donnie?”

“Yes, I do,” Donnie replied. He was usually the rational, scientific type, but this argument was really steaming his shell!

“Good one, Donnie!” Raph smirked. “Speaking of ‘good one,’ you sure this plan will work, Leo?” he asked.

A hush suddenly fell over the van. Leo kept his eyes on the road. “It has to work.”