We're back on the final chapter.

REMINDER: I DO NOT OWN JIMMY NEUTRON, AVATAR OR ANY OF THE CHARACTERS.

Meanwhile, the heroes were recovering from their battle with the Shadowbender/Shadow Avatar. Past Korra leaves the spirit portals open to bring balance to humans and spirits. They managed to remove Raiko from the ice and held him captive, but kept Beautiful Gorgeous in her ice prison.

Korra walked to her past self and Past Mako. "So, you've broken up for good now, and you're still friends?"

"Yeah, we're good, now." Past Korra said. "And me dating Asami, when will that happen?"

"Well, it takes three years, but you'll get there, someday." Korra said before her past self smiled.

"I'm sure I will, too." Past Asami said.

"Yeah, and you're gonna love being the Avatar's girlfriend." Sheen said.

Past Unalaq stranded there, defeated. His fate to become the Dark Avatar was erased from existence. Jimmy walked to him.

"Hey, what's wrong?" he asked concerned.

"I was supposed to fuse with Vaatu in the original timeline, right? But, now that Raava and Vaatu becomes Raavaatu in Korra, what am I supposed to do? I've invaded the South; I've been too focused on Harmonic Convergence instead of my children. I don't know what to do."

Jimmy comforts Past Unalaq. "Hey, you can still do good things. At least your niece left the portals open. She won't be the bridge between worlds. And you don't have to be the bad guy. You are you."

Past Unalaq was touched by Jimmy's confrontation. He puts his hand on his shoulder. "Thank you… Jimmy."

Meanwhile, Jimmy, his dog and friends and Team Avatar of the future were ready to go back to the future, while their past selves and their friends and family waved goodbye.

"Hey, Jimmy! Thanks for keeping my link to the past Avatars from being severed!" Past Korra said.

"Jimmy help people, you know. But his inventions goes wrong sometimes." Carl said. "Thanks for showing me your world's llamas."

"What can I say? I'm crazy over llamas!" Past Bolin said.

The heroes entered the Time Booth. Jimmy writes on the keyboard to the future, and the Time Booth vanished back to three years to the future.

Past Korra and Asami looked at each other nervously. But, knowing about their future, they kissed before three years to the future. Korra's friends and family were happy.

Later, the Time Booth re-appeared to the future. Jimmy and his friends left the booth with Raiko.

"You think you've got what it takes to press charges against me? I've got the best lawyers. The law is still on my side." Raiko said evilly before turning to Zhu Li, Varrick, Tenzin, Tonraq, and a reformed Unalaq.

"Not in three years of prison. After Jimmy and Korra changed your past, the citizens think of you as a fraud, lying to them about Korra being the mastermind instead of Varrick. And not to mention Buttercup divorced you."

Raiko was shocked in defeat. "No. No, this can't be!"

"Looks like no lawyers are gonna help you." Korra smirked.

"Goodbye, former President Rat-Ko." Jimmy said.

"Raiko! It's Raiko!" Raiko said in defeat before Lu ang Gang takes him away to prison. "I'll get you, Avatar Korra and Jimmy Neutron!"

Jimmy pressed his button to make the portal back to his dimension, where Jet Fusion, Commander Baker, and the BTSO agents waited.

"This isn't over, Jimmy. You haven't seen the last of me." she said before she was taken away.

"Adios, Beautiful." Sheen said.

"Let's go home." Carl said.

"Hey, can we hang out with you guys?" Bolin asked.

"Sure, come with us to the Candy Bar." Libby said.

"Sure thing!" Bolin said existed.

The heroes went through the portal.

"These kids are swell." Varrick said before kissing Zhu Li.

"Are we certain that the Shadowbender is dead?" Lin asked.

"Korra and Jimmy saw to that." Tonraq said.

"I doubt that we ever see him again." Tenzin said. "In the Netherworld."

In the Netherworld, the Shadowbender was grunting in frustration about his defeat and death.

"Hey, does anyone cared that I am not a Netherworld type?" he asked angrily.

He turned and saw a humanoid black liquid monster that resembled Korra with a green imprint. It was KorRaavu, a dark side of Avatar Korra from the Prism Universe.

"Hey, you think you've got problems here?" she asked depressed.

Meanwhile that night, it was karaoke night. At the Candy Bar, Jimmy, Carl, Sheen, Cindy, Libby, Korra, Asami, Mako and Bolin were celebrating. They've eating ice cream and candy.

Sheen and Bolin were making a toast.

"To the balance of the worlds." Sheen said.

"And the birth of Raavaatu." Bolin said.

"Thanks, you guys. Not usually Raava and Vaatu's thing, but I miss being whole." Raavaatu said in Korra's body.

"So, what else next?" Carl asked.

"Jimmy, should we do karaoke?" Korra asked.

"We're next right now." Jimmy said before he and Korra walked up to the stage.

The people cheered as the karaoke was starting. Jimmy and Korra were about to sing.

"From here to the stars"

"Fuelled by candy bars"

"Rides a kid with a knack"

"For invention"

Jimmy takes the lead.

"With a super-powered mind"

"A mechanical canine"

"He rescues the day from sure destruction"

It was Korra's turn.

"He's got to save the world and get to school on time"

"So many things to do and not much time"

"So wound the ground up in the air"

"Out in to the atmosphere"

Team Avatar, Jimmy's friends and the people cheered for the song. The Avatar and boy genius were duetting.

"Who can we count on?"

"Jimmy Neutron!"

The people screamed and cheered for Jimmy and Korra's duet. Korra pulled Asami up the stage and kissed her. They looked down to Jimmy with a smile, their friends joined with them, and they were about to say to the audience.

"Gotta blast!"

And there you have it, the very end of this great crossover story of the Avatar and Boy Genius. Review if you like any of my stories.