[AN my first crossover, enjoy!]
Disembodied Voice from Nowhere's POV
Retroville...
"Alright gang, let's give this inter-dimensional portal another test run." Jimmy said. They were building an inter-dimensional portal, again. Only this time with a few upgrades.
"Cindy, pull the switch!"He said to his girlfriend, Cindy Vortex.
"Sure thing!"She said and eagerly pulled the switch. A gleaming portal of energy grew before their very eyes.
"Now let's see what our inter-dimensional friends are up to."Jimmy said peering through the telescope.
"Wait a moment, what's this? Fellow geniuses! Let's go meet them!"An with that he ran through the portal.
"Ah, what the heck? WHEEEEEE!"Said Sheen, one of Jimmy's friends.
"I'll go, I just want to see what inter-dimensional llamas look like."Said Carl, another one of Jimmy's friends.
Libby, Cindy's best friend, shrugged and ran into the portal.
"Well, I'm talking to no one, guess I'll go."Cindy said and she to ran into the portal.
Meanwhile, in Danville...
"Hey Ferb, do you think that somewhere in the galaxy, there are other geniuses that are lonely, and need a building assistant?"Phineas asked. His stepbrother and best friend Ferb nodded.
"Ferb, I know what we're going to do today!"
"Hey Phineas, whatcha' doin'?"Asked Isabella as she walked through the gate.
"We're building a rocket to search for other inventors!"
"Cool, can I help?"She eagerly asked.
"Sure! Hey, where's-"
Hold it! We don't have time for a subplot, sorry.
"Okay."Phineas responded to my request.
Then they heard a noise behind them, like a high-energy inter-dimensional portal. They turned around to see five kids standing there.
"Hi, my name is Jimmy Neutron."Jimmy said holding out his hand for Phineas to shake.