Tremorton High. A regular highschool for the teens & adults in the city. It seems normal at first, but there's one particular student that's no ordinary person. Hell, she's not even human. It was XJ-9 herself, aka Jenny Wakeman. A female robot designed specifically to not only protect the Earth of different sorts of crimes & dangers, but to also be a teenager. Today was her last day in highschool, as she & all of her fellow students have now graduated & are moving onto new things in their lives. That may sound good to her friends & such, despite experiencing the highs & lows of being a teenager, she was still that. Still the same metallic skirt, same twin rocket pigtails, still a robot teen. Meanwhile, as she was cleaning up her locker, Jenny could hear the snarky laughter of her two highschool rivals. Brit & Tiff, aka the Crust Cousins.

Brit: Well if it isn't our robotic nuisance of a friend.~

Tiff: A shame we won't get to see you much & mess around with ya, since we'll be busy with our fashion careers.~

Jenny: Yeah yeah. Whatever you two.

Brit: Oh don't be like that Jenny dear. We may somewhat envy your somewhat eternal youth, but we've been enjoying the splendors of being adults.

Tiff: Being able to drive, have full paying jobs, even experiencing the more mature romances baby.

Brit: Indeed. Though it's a shame you can't experience such things. Since you're technically still a teen.~

The two cackle & laugh as they leave the robot be, as she grumbles & sighs a bit since they were right about her still being built as a teenager. Jenny wondered if she was gonna stay like this forever?

—Meanwhile—

The United were in their hover car, flying past a sign welcoming people to Tremorton.

Timmy: So why are we stopping here again?

Jimmy: We need to refuel on gas, since it'll take awhile to get back to Harmonia.

SpongeBob: Hey, this place seems familiar.

Jimmy: That's because this is the home of both the scientist Nora Wakeman & her robotic daughter XJ-9. Jenny's profile was on the files that President Kickbutt gave us.

Danny: Think we'll run into her while we're here?

Timmy: Most likely. I bet someone like her is full of high spirits.

As they fly over to a nearby gas station, Jenny was walking besides her two best friends Brad & Tuck Carbunkle, a bit upset on realizing how everyone's growing up around her but herself.

Brad: Cheer up Jenny. You shouldn't beat yourself up for it.

Jenny: That's easy for you two to say. Brad, you've started growing a mustache, Tuck is starting middle school soon, & even Sheldon moved away after getting a job offer to work in Professor Membrane's company. Everyone's all grown up, while I'm stuck as a teenage girl. Will Mom even let me become an adult or is this just it?

Tuck: Come on, I'm sure your mom has a heart. It's not like she's gonna scrap ya & begin building a robot to study about adults or something, right?

The robot girl looked away, prompting the older brother to lightly smack him upside the head.

Brad: What my insensitive brother was trying to say is there's no need to worry & rush things.

Jenny: I suppose..

As the trio continue walking, they soon hear cries for help. The three of them look over & see a four story building on fire. Jenny quickly springs into action, as she has her twin rocket pigtails fly herself off to the rescue. Her arms morph into cannons that spray a foam like substance to try to put out the fire. She rushes to pick up people that were close to the windows & balconies & set them down safely to rescue more of them. Although things seem to be going well, the fire spreads faster & some people accidentally fall to try to avoid the flames. Jenny tries to rush in to save them, but they were luckily caught by an unexpected ghostly hero to help aid in this mission.

Jenny: Wow! Thanks. Who are you?

Danny: No prob. And it's Danny. Danny Phantom.

While the ghost guy sets down the people he caught in the air, his allies were there to help, as Jimmy & his robot dog companion rescue the remaining people out of the burning building, & Timmy using his wand to create a blast of water to inflate SpongeBob to a large size, in which the spongy hero squeezes himself to release a torrent flood of H2O to extinguish the fires for good. With the flames put out & the people rescued, the crowd cheered at the five heroes on saving their lives.

Jenny: Thanks for helping out. Who are you guys?

Timmy: Name's Timmy Turner. That's Jimmy Neutron, SpongeBob SquarePants, & I see you met Danny. We're the United.

Jimmy: And you must be XJ-9, right? Daughter of Nora Wakeman, renowned scientist & retired member of Skyway Patrol.

Jenny: Wow. Heh. Did you research about me or something?

SpongeBob: We were actually stopping by here to refuel our hover car.

Timmy: We just know about ya from some reports from the Hero League. You're a pretty cool robot.

Jenny: Aw, thanks. Hehe. You guys seem quite impressive as well.

The five heroes chuckle a bit as Jenny's two friends arrive & are curious of her new acquaintances.

—Later—

The robotic teen, her friends & mom, & the United were now at her mom's home, as they shared any of their big events they've taken part of. Whether it be the team's first team up to take on the Syndicate, & their recent mission of putting a stop to a small alliance between Dark Mayhem's son & an expelled college student turned evil scientist, or XJ-9's feats of battling various robots & aliens, & even stopping an alien robot race called the Cluster once & for all, though the former queen Vexus still lurking somewhere. The Heroes were just happy to be bounding well, while Brad, Tuck & Nora listened.

Jimmy: You've faced quite an interesting rogues gallery.

Jenny: Same with you guys. Guess there's still more villains & other threats I haven't faced yet.

Timmy: Have you thought of joining a hero group before?

Jenny: Well, briefly with this one group from space called the Teen Team, but I didn't really like how they kinda operated. Didn't even care to protect people no matter what.

SpongeBob: Maybe you could join our team! We do a lot of saving folks!

Jenny: I mean, sounds tempting. And I recently graduated from highschool so, can I please join them mom?

Ms Wakeman: Well.. you have been through a lot. And I already gathered more than enough studies on teenagers. Though, I still need to figure out the best course to upgrade you into an adult without harming any of the important components & circuitry.

Danny: I mean, if you need extra help, I'm sure Jimmy here can help. He's built & upgraded tons of robots & gadgets.

Jimmy: Right. Should be a piece of cake.

Jenny: Please mom, can you let them help?

The mom was a bit skeptical at first, but sighs in accepting assistance.

Ms Wakeman: Alright. But please be delicate when we're doing the process you hear?

Jimmy: You have my word. I will do my best for your daughter.

Tuck : Looks like we'll be assistants then.

Timmy: Guess this'll mean you'll get close to a girl, eh?~

Jimmy: I told you before I already have a girlfriend, Turner!

Timmy: Suuuure you do.~

The smart guy sighed, as soon as a montage began of him & the elderly woman modifying & upgrading the robot girl's body & inner workings.

Jimmy: Power drill.

Danny: Power drill.

Fenton gives Neutron the needed tool he requested & immediately uses it.

Ms Wakeman: Circuit clamps.

Brad: Circuit clamps.

The older Carbunkle brother gives the lady the tool she requested & uses it as well. The upgrading montage continues, as while the two geniuses get aid from Brad, Danny & Timmy, SpongeBob & Tuck pass the time with video games & bubble blowing. After around an hour or so of their hard work, the two were done. The last thing to do now was for Nora to flip the switch to reactivate her fine creation & daughter figure. Jenny wakes up, as she opens her eyes & blinks to see everyone looking at her.

Jenny: Well? How did it go, everyone?

Tuck: Woooow..

Danny: See for yourself.

The gang backed up so that the robot girl could look at a mirror displayed for her. As she approached, XJ-9 could see her own reflection. Not only was her height grew by a few inches, but now her whole style was different. Her two pigtails were combined into a fashionable ponytail, & her metallic chest plate & skirt were now a lovely metal dress that concealed her screw like belly button. No longer a teenage robot. She was finally an adult.

Jenny: This is me? I look.. incredible! I feel the same, but also different at the same time!

Ms Wakeman: Phew. I'm glad the process worked. It took a bit of elbow grease to install some of those extra enhancements that'll help you on your missions.

SpongeBob: Alright! Now you can face evil like never before!

Timmy: Will this also mean you will join us?

Jenny: How can I refuse? You helped me not only with that building fire earlier, but also helping me metamorphosize into this new form! I'd be honored to be part of your team.

Tuck: Does this mean you'll leave us..?

As the youngest in the room felt sad about his one true friend possibly leaving, he was suddenly picked up & hugged by her.

Jenny: It'll be fine Tuck dear. I'll be sure to come by to hang out with you & Brad. Heck, I could even bring you to Harmonia whenever.

As XJ-9 sets Tuck back down, she turns over to Neutron & shakes his hand.

Jimmy: In that case, welcome to the United Jenny Wakeman.

And so, the heroic team of four was now a team of five. As they celebrated her joining them, XJ-9's mother figure felt a sort of bittersweet feeling, seeing her own girl now leaving the nest of sorts to do more good than ever before. For now, the sky's the limit of what evil forces the United will face.

{To be continued}