At the Rookies club house, the boys and girls were all meeting together as it was a normal day so far.
"Okay, we had to move some meetings around because of incoming thirteenth birthdays in the Kids Next Door which means they have to be decommissioned, but I think we're about good for the rest of the week," Cindy said. "Does anyone have a topic they'd like to discuss?"
"Hmm..." Robin paused to think.
"Uhh... I don't know." Kaitlin shrugged.
"Okay, we should be good then..." Cindy said. "Now, welcoming new members: Good idea or bad idea?"
There was then suddenly a rumbling heard outside and everyone came to the clubhouse window to check it out. Some sort of flying machine came out and landed in Robin's backyard and out came Numbuh 86 from the Kids Next Door.
"Listen up!" Numbuh 86 told the others. "I require volunteers for an extra super secret mission!"
"Ooh, ooh, pick me, Numbuh 86!" Maxwell begged. "It's to guard the Ultra Important Kids Next Door Code Module, right?"
"No, the Code Module is safe and secure in the Kids Next Door Moonbase." Numbuh 86 told him.
"You can't fool me with your reverse psychology," Maxwell glared. "I heard the Code Module can monitor when every kid is watching TV; with infomation like that adults could change the TV schedule borfied zillions of-"
"This mission is for GIRLS ONLY!" Numbuh 86 snapped.
Cindy giggled to Maxwell as he was overreacting. "Silly Maxie Moo."
Johnny and Kaitlin then laughed at Maxwell since Cindy revealed his pet name.
"Girls?!" Maxwell, Johnny, and Mike asked.
"A boy would be an unacceptable security risk," Numbuh 86 explained before looking to Cindy, Kaitlin, and Robin. "So, what do you say, girls?"
"Go on an all night mission with you?" Kaitlin nearly scoffed. "Sorry... But I'm gonna be busy not doing that!"
"What about you, Cindy or Robin?" Numbuh 86 asked. "Cindy, you are an operative now like I am."
"Hmm... Well, I got nothing else to do tonight." Cindy confessed.
"Great, how about you, Robin?" Numbuh 86 then asked.
"Sure!" Robin smiled. "I'm up for anything if Cindy is. Who else will be there?"
"Numbuh 3, 23, and 12 also from the Kids Next Door will be there as well." Numbuh 86 reported.
"We will be there, Numbuh 86," Cindy promised. "You can count on us."
"Come on then, we better go before it gets dark." Numbuh 86 told the girls.
"Yes, ma'am!" Cindy and Robin saluted and went to the vehicle.
"Oh, I almost forgot," Cindy said before zipping back to behind her podium and pounded her gavel. "Dismissed!" she then went back to the vehicle and went with the others.
There was Numbuh 3 who Cindy knew very well and there appeared to be a punk goth girl with brown hair in low pigtails, a short-sleeved black shirt, golden bracelets, black dress shoes, and a girl with light brown hair tied in a ponytail with pink overalls, a white shirt, white socks, and purple Mary Janes.
"That must be Numbuh 23 and Numbuh 12." Robin suggested.
"Must be." Cindy agreed.
"That's us!" Numbuh 12 waved with a friendly smile.
"Sup?" Numbuh 23 smirked.
Numbuh 3 giggled. "This is gonna be the best mission ever! Numbuh 86 said there'd be popcorn!"
"I love popcorn." Cindy smiled.
"Especially with extra butter." Robin added.
Numbuh 3 giggled in agreement.
Cindy looked to Numbuh 12 and couldn't help but think she looked familiar somehow.
"So, you're not a Kids Next Door member?" Numbuh 12 asked Robin.
"No, but Cindy's one of my close friends, so I guess that's why I can come too..." Robin shrugged. "I wonder what kind of mission we'll be doing?"
"Must be serious if it's at night," Cindy said, then looked to Numbuh 12. "You look familiar somehow, what's your real name?"
"Hannah." Numbuh 12 said.
"I'm Kuki!" Numbuh 3 giggled.
"And I'm Virginia." Numbuh 23 added.
"What's your last name?" Cindy then asked the light brown-haired girl.
"Dastardly." Numbuh 12 revealed.
"Hmm..." Cindy hummed to Hannah, a little suspiciously.
Later on, they were now in front of Numbuh 86's house with a 'couple of other girls'.
"This is a nice house that Numbuh 86 has got." Robin commented.
"All right, now before we get started on the mission, let me introduce you to your fellow operatives," Numbuh 86 said as she didn't have her helmet on this time. "Numbuh 12, Numbuh 23, Numbuh 3, guest of Numbuh 82's, Robin Snyder with Numbuh 82, and-" she then looked to Maxwell and Numbuh 4 clearly disguised as girls. "Uh, do I know you two?"
"Um, my name is Maxine," Maxwell made up. "Maxine Harrison."
"And I'm a new operative," Numbuh 4 said, trying to make his voice go high. "Numbuh Four...Um... 30-Teen...Seven, and, um, Maxine is my cousin!"
"Ooookay...?" Numbuh 86 replied. "Welcome aboard, Maxine and Numbuh 4-30-teen-7! Our mission is to have!...A slumber party..." she then sighed once she admitted that.
"A cruddy slumber party?!" Numbuh 4 complained.
"I thought this was a mission to guard the Code Mod-I mean... Hooray! How slumberrific!" Maxwell added, trying to make his voice go high.
"I know it's unusual, but my mum's forcing me to a slumber party, and I had to invite someone." Numbuh 86 frowned.
"Why don't you invite some of your own friends?" Kuki suggested with a chipper smile.
Numbuh 86 looked to her and bowed her head as she didn't have any friends.
"Oh..." Kuki then frowned.
"Don't worry, Numbuh 86," Hannah soothed. "I'll be your friend."
"Me too." Robin added.
"There's something funny about this Numbuh 12 girl..." Cindy said to herself.
"Hello, ladies!" a Scottish woman came out with a cheerful smile as she took out her camera. "Don't just stand there, Fanny Pants, let me take your picture!" she then snapped her camera to take a picture of the slumber party crew.
"MUM!" Numbuh 86 complained.
"Fanny?" Numbuh 4 asked before laughing.
"Fanny Pants?" Cindy added in.
"Oh, she may not like me to call her that now that she's a big girl," Mrs. Fulbright said. "Why, she's even a Big Fanny now, she'll always be Little Fanny to me!"
The others giggled to this.
"What, why are we all standing out here in the cold like cuckoo birds?" Mrs. Fulbright then asked. "Get in here and, uh... Do whatever it is girls do at slumber parties."
"But I don't know what you're supposed to do." Numbuh 86 frowned.
"Don't worry," Hannah coaxed. "I'll show you."
"Come on!" Robin smiled.
The girls went inside the house, Numbuh 4 and Maxwell were about to sneak away until Mrs. Fulbright grabbed them and pulled them inside.
'Ah, ah, ah!" Mrs. Fulbright stopped Numbuh 4 and Maxwell. "You get in there, little missies! Heaven forbid you should miss the slumber party of the year..." she then smiled evilly as she shut the door.
They all then followed Numbuh 86 upstairs.