Over at the United's base, the group were talking about some shops around the city while enjoying some freshly made Krabby Patties their yellow square pal just made.

Timmy: Man these patties are good. Would definitely say they're the best burgers I ever had.

Jimmy: Yeah. Though I can't dismiss Good Burger either. So it's a tie in my opinion.

Danny: I used to like Nasty Burger in my teen years, but after working there for a few months I kinda lost my appetite from all the cleaning & food thrown at my face.

Just then, NICKS appears on one of the monitors, alerting the heroes there was an incoming call.

SpongeBob: Oh? I guess it's something important.

Timmy: Is it from the mayor or the chief of police or someone else?

NICKS: Incoming call from Super President Kickbutt.

Jimmy: The very president of the Hero League? We better see what she wants.

NICKS soon opens the call, as they were greeted by the Super President herself.

President Kickbutt: Greetings United. It's great to finally meet the newest team of heroes. Heard you four stopped four former henchmen of King Crab.

Danny: Um, thanks. So what do you wanna discuss with us?

President Kickbutt: There's been a recent attack in Metroburg involving some drones sent from an unknown source. We already have T-Force on the scene to face the threat, but we still need to know the villain who is sending them. That's why I want you to help out.

SpongeBob: Wow! Our first ever big time mission! This'll be great!

Timmy: Well guys, time to get ready. We're going to Metroburg!

—Later On, In Metroburg—

After around an hour & a half flight from Harmonia to Metroburg via Jimmy's hover car, the United arrived on the scene, as the four & Goddard Park the vehicle & began looking around. The streets were quite a mess, with cars thrown around & some buildings & the pavement broken. Just as they look about, a wall gets busted open, showing what appeared to be some sort of insectoid shaped robot fighting a middle aged man in a blue & orange superhero costume, wrestling about for a bit before the guy punched a hole into the machine's chest, ripping out it's circuits & shutting it down. The four then realized that this man was Thunderman. Veteran superhero with the powers of super strength & flight.

Hank: Phew! Took a while, but hopefully that's the last one for now.

Timmy: Holy crap, it's him!

As the caped hero cracks his back in place, the four other heroes then see the rest of the T-Force run over to him, as they seemed to have also been dealing with these robots as well.

Barb: There you are Hank. Why are there so many of these dang robots?

Billy: Maybe it's National Robot Attack Day?

Just as the group were figuring things out, they soon notice the four newcomers & their pet robot dog.

Jimmy: Um, greetings. We're the United. We came here under orders of Super President Kickbutt to help you on your mission. I'm Jimmy Neutron, this is Timmy Turner, Danny Phantom & SpongeBob SquarePants.

Hank: Ah. Glad to meet new heroes. You probably know that I'm Thunderman.

Barb: And I'm Electress.

Nora: Lasergirl.

Billy: Quick Kid. I mean Kid Quick!

Chloe: Thunderbaby. Ugh, I gotta get a new name.

Phoebe: And we're the Thunder Twins.

Max: Yeah, so you best stand back & get a few pointers from a very experienced team.

Just then another robot bursts from underground behind them, causing Max to scream a bit while Danny rushes past the Thundermans to deliver a strong kick, knocking the machine into a concrete wall, making it quickly retreat by digging another hole into the ground.

Timmy: We gotta go follow it!

SpongeBob: Maybe it'll lead us to the source of where these ant-like bots are coming from.

Barb: Good idea.

And so the United & T-Force journey down into the hole. As the two hero teams kept going, they shared some stories about one another & their adventures so far & the many hilarious hijinx they had to deal with. Eventually they came to a fork in the road, where there were three paths splitting apart.

Nora: Where do we go now?

Jimmy: We may need to split up into groups of three. Goddard & I will go with the Thunderman & Electress.

Phoebe: Me & Max can go with Danny & Timmy.

Chloe: Sweet, we get to partner up with the mascot teammate baby!

Hank: Alright then everyone. Keep your guard up. There's no telling when these things will try to attack us.

Max: Don't sweat it dad. We got this.

So the three groups go down the three separate holes. After a while of walking, Phoebe, Max, Timmy & Danny soon felt some small quakes until they encountered a much larger robot. The front faceplate opens to a live video revealing the real mastermind behind this.

Dark Mayhem Jr: Well well well. Max & Phoebe Tuunderman. At last I shall destroy you two!

Phoebe: Dark Mayhem Jr?

Timmy: Pfft, that's his name?

Dark Mayhem Jr: Don't call me that! I am now going to make a name for myself!

Max: What, be instead called Dork Mayhem? How are you even doing this while still behind bars?

Dark Mayhem Jr: Well thanks to a genius non-super around our age, me & my friends are able to control these Mayhem Ant Drones from our cells.

Dark Mayhem: You mean MY Mayhem Ant Drones young man!

Phoebe: Is that Dark Mayhem in your cell?

Dark Mayhem Jr, No, our fathers' cell is next door to ours sadly.

Strongdor: Strongdor also here too for moral support.

Danny: Well that's cool & all, but we're gonna stop you for good.

The phantom then blasts an ectobeam at the drone, as it only just pushed it back. The ant-like robot lets out a roar, as it begins to attack the four heroes. While that was going, Billy, Nora, Chloe & SpongeBob also encountered a larger Mayhem Ant Drone as well. This time being remote controlled by She-Crab. Daughter of King Crab.

She-Crab: Ugh. Can't believe I like gotta deal with the younger kids & some weird yellow freak. Like ew.

Nora: You're lucky I can't laser you through the screen to your face!

The second youngest Thunderman proceeded to blast the robot into a corner with her laser eyes for a bit until she couldn't anymore. Some more ant drones pop out of the ground, as the speedster & sea sponge fend them off while Chloe runs to her sister's aid to dodge an incoming swipe attack. While they face this swarm, Hank, Barb & Jimmy are dealing with a large Mayhem Ant Drone controlled by Strongdor's son Krondor.

Krondor: I was expecting to face the elderly Thundermans, but never indubitably face THE Jimmy Neutron, boy genius. But freight not, for I shall be ready to face you in metallic fisticuffs.

Jimmy: Um, sure?

Neutron dodges the claws of the bot, as he was using NICKS on his watch to find a way to hack into it. Goddard, Thunderman, & Electress help distract the machine for him. Eventually the three large Mayhem Ant Drones burrow up into the surface along with their smaller units. The United & T-Force followed suit & were face-to-face with quite the swarm.

Timmy: Uh.. Anyone got a plan to be at these things besides just hitting hard?

Billy: We could hit em soft?

Jimmy: Actually, I think I could be able to break through their firewalls with NICKS, but I'll need to be very close to those three main drones.

Chloe: I can warp ya over to em with ease, but we may need the others to distract them.

Hank: Leave that to us. You two do your thing. Thunderman, away!

With that said, the caped man flies up into the air, as he divebombs at a few of the bots, slamming them down hard with his fists. The others join him in the conflict, as Chloe warps Neutron close to the three main bots. He then quickly uses his program to start breaking through the firewalls & defenses while also dodging their attacks.

Dark Mayhem Jr: I won't let you stop us! I will succeed where my father failed & get vengeance upon the Thundermans!

She-Crab: Yeesh dude. Y'all need a chill pill.

Krondor: I heartedly agree with her ol' chap.

Dark Mayhem Jr: Just keep mashing buttons damnit!

While that was going on, the rest of the heroes were tearing through the swarm with their punches, kicks, karate chops, laser beams, electricity, magic beams, ecto blasts, & fire & ice breaths. As things started heating up, Jimmy was finally able to hack into the Mayhem Ant systems, causing them all to shut down minus the three larger ones already being remote controlled by the young villains.

Dark Mayhem Jr: NOOOO!

Timmy: Anyone wanna do the honors?

Phoebe: Max, wanna finish them off with our twin power move?

Max: On one hand, ew, gross, but on the other, I do like finishing off a mission with cool explosions.

And so the Thunder Twins held hands & started generating a strong source of energy, as everyone else backed away from them. The two then release a strong EMP blast towards the three drones, frying their circuits & tearing them to pieces. The three young villains back in the Metroburg superjail lost connection, as their plans have been foiled.

Dark Mayhem Jr: No! No no! NOOOOO!

The leader of the trio proceeded to have a fit, as he threw the device he used hard onto the ground & kept stomping on it while his two allies backed up as they & their parents listened to his rage-filled tantrum.

Dark Mayhem: See, this is the problem with you next gen villains! You take your first evil revenge plan way too seriously!

Strongdor: Strongdor agree wholeheartedly. "It just a scheme bro" as they say.

—Later—

A cleaning team was picking up the parts & pieces of the drones, as Super President Kickbutt & two of her bodyguards approached the United & T-Force to congratulate them on their recent mission.

President Kickbutt: Congratulations Thundermans & United. You both did quite well stopping this attack on our fair city.

Jimmy: No problem. Just doing our part.

Danny: Guess we'll be going now. It was nice teaming up with some great heroes.

Hank: Likewise Danny Phantom. Come by our place whenever in Hiddenville if ya like, ok?

The ghost guy & Thunderman shake hands, as he & his family leave. Before the United were about to go too, the president herself stopped them for a moment.

President Kickbutt: Hang on, before you go on your way, we'd like to hand you guys these files on various recorded freelance heroes across the country. Thought you guys could use these just in case.

She handed them some folders as the group got into their hover car & flew off. Jimmy takes a look & sees various people. From the robotic teenage robot hero of Tremorton, XJ-9, to the tiger themed hero of Miracle City, El Tigre, to the mask wearing freelancer hero of New York City, Casey Jones, the list was full of potential recruits for their team in the near future.

{To be continued}