I don't own - in any way, shape, and form - Carmen Sandiego or Kim Possible (except my OC Kat Possible, who becomes Carmen Sandiego). Also, twenty-four hours when this story got posted with just the prologue, and I've already got twelve reviews, twenty-nine follows, thirty faves, and five hundred and ninety-four views for my crossover fanfic (which I'm satisfied with)! Thank you so much for reading it, seeing it, and liking it!

I'd like to give a big thanks to these people for:

Follows:

Ravenclaw Queen16, ShadowRealmComics, Srdl1337, animallover41097, JUchia, Justarandomdude, manticore-gurl071134, Swisstrekkie, AnimeGamerGirl23, TheCatAteMyRoughDraft, drummergal825, 3101987, The Forgotten Guardian, daniellescott1998, Syafiq, edgar12345, BardofWorlds, Solartiger, LombaxElite, MaurauderPrime12, aiden scarletwolf, lpeetz22, demon19027, lordbeetle0709, Avenger2003, humo146, Comictroll, Ghostbuster30, and follychone

Faves:

ShadowRealmComics, Srdl1337, animallover41097, G.S. Phoenix, drummergal825, Swisstrekkie, kitta160, follychone, AnimeGamerGirl23, TheCatAteMyRoughDraft, 3101987, nightmaster000, Syafiq, The Forgotten Guardian, daniellescott1998, edgar12345, lpeetz22, aiden scarletwolf, Itharius the Hunter, MaurauderPrime12, Solartiger, lordbeetle0709, humo146, Avenger2003, Rockyweird, Tworig Maximum, Comictroll, Wan-Torn Hero, Ghostbuster30, and jhellou

Reviews:

drummergal825: I'm thrilled you like my story (even if it's just the prologue), but it means a lot that you enjoyed reading it. And don't worry, I'll write the next chapter and post it as soon as I'm done. Anyways, thanks so much for the vote of confidence; it made my day! :D

Jenjafrpar (Guest): I'm delighted you like my story and don't worry, the next chapter is being written as we speak.

nightmaster000: Well, I'm happy you love it and thank you very much for reviewing my prologue chapter. The next chapter is being written, so there's going to be more surprises along the way :D

AnimeGamerGirl23: Thank you very much for loving this fiction, and I'm glad you're excited about the family reunion, the encounter with Crackle, and the adventures Kat's going to have with her family!

manticore-gurl071134: I saw the old series, played the video games, and watched the series, and loved it since I was little. When Netflix announced they were doing a remake of it, I was so happy; I binge-watched the entire season in one day. After the first episode, I was hooked. Then, I was also watching Kim Possible, and through those two incredible stories, there'd have to be a new one embedded inside. There were a bunch of Kim Possible fanfics (some are really good) that talked about Kim having an older sibling and being away from the family for a while. With Carmen, she tries to understand who she is and where she came from; hence, why I thought it would be a cool idea to combine the two: 'What if Carmen Sandiego is Kim Possible's long-lost older sister that got kidnapped ten years ago?' Reading those gave me the idea, and here we are now! I'm glad you like it, and I'll try to post the new chapter soon :D

Solartiger: Thanks so much for the vote of confidence and encouragement!

HeckYeck (Guest): Thank you very much for your kind review :D Kat's family reunion won't happen for a while, but trust me - it will be a bit emotional (for her at least) to reunite with her family that was taken away from her for eleven years, so the whole thing will be great. She needs to do these little jobs around first then she returns on American soil for the big reveal...and hopefully, getting to know them all over again! I'm typing this chapter as fast as I can, so be patient, and it will come!

humo146: Don't worry, more will be on the way!

Avenger2003: I'm glad that you liked it and favored and followed me and this story :D

Brooke (Guest): I'm very honored that you liked it. This chapter is full of her trying to integrate herself in Spanish society and then...the real fun begins.

Tworig Maximum: Thanks very much that you're reading this story and how it's grown on you. I know you're anxiously waiting for the next chapter (like everyone else). But don't worry, the next chapter is being finalized so that it will be posted!

Ghostbuster30: I am so glad you like this story! And don't worry, the next chapter will be posted soon!

And now, here's chapter 1!

Chapter 1: Layover in Spain

Kat Possible, or the newly named 'Carmen Sandiego,' slept through the night as Shadowsan drove. The first time - after her breakout from the island - she fell into a dreamless, deep sleep. The exhaustion of planning and escaping a secret criminal empire, finding out that she was - forcibly removed - from her family, and that said organization is planning to exploit, hurt, destroy, and kill those who get in their way for global conquest, really takes a lot out of a fifteen-year-old. But, it was also a moment of acceptance and honesty. Kat admits there were some good memories of being raised on the island; playing on the beach, Coach Brunt making her famous sweet, barbecue, baby back ribs for a Summer cookout, stargazing the night sky, and eating red velvet cupcakes whenever she got upset about something (or it was her birthday). Because of her kidnapping, she found strength, the determination to fight for what she believes in, and skills she can use to protect the people of the world from V.I.L.E. Because of her kidnapping, she found a friend - and confidant - for life in Player, and a mentor to guide her to be both hero and villain.

It was early in the morning when Shadowsan got a call from Player.

"Hello?"

"Mr. Shadowsan?"

"Ah, Player, how nice of you to call."

"I wanted to know how's Carmen doing?"

"She's asleep. After the onslaught of honesty and the adrenaline rush she had, Kat deserves a bit of undisturbed rest," he explained.

On the bridge, Shadowsan drove the boat when he saw a seagull flying through the air. He knew it was a sign that they've almost reached port in Spain. He tells Player to alert him that they're about to reach their destination.

"Player, we're about to reach Spain. It'll take us a few hours to get there, but we'll make contact with you," Shadowsan informs.

"Not a problem, man. Just give me a call when you have Wi-Fi, and we'll talk then," responds Player. He hangs up, leaving Shadowsan to his thoughts. Last night, he saw his former student (and favorite pupil) become a woman of strength and grace; a lady who's brave and determined to fight for the innocents of the world. Seeing her take her weapon, and attack him without hesitation - despite the apparent fear in her eyes - showed bravery in her part; Carmen Sandiego isn't afraid to die, but isn't afraid to live, as well.

A few hours later, Shadowsan landed at the Santa Cruz de Tenerife in Huelva around 5:15 am. They docked the boat and turned it off, glad that the GPS tracker located on the ship's stern was disabled, so V.I.L.E. can't hunt them down anymore. He came down to the cabin, walked down the stairs, and saw his pupil sleeping peacefully on the sofa. He smiled, softly that she will be a legend; an anti-hero to do what she has to do to protect - and save - lives.

Silently, he headed over to her and roused her from her sleep.

"Carmen?" he said. He shook her to wake her up. "Carmen, it's time to wake up," he whispered. She groaned and turned around to squint at him.

"Are we there yet?" she whined. Shadowsan smiles at his student. Now, she's - finally - acting like a teenager, so he let it slide.

"Almost. We've just landed in Huelva, so now we have to drive five hours all the way to Madrid, which is where my residency is," he informed. Kat sat up and stretched to get the sleep off.

"Five hours 'til we get to Madrid?"

"From there, we'll be able to make our plan on the drives and your training for your missions," he informed her.

She stood up and put on her hat, coat, and grabbed her bag, ready to leave.

"When we get to Madrid, there'd better be breakfast, Shadow," she said grumpily.

"Don't worry, Carmen, as soon as we reach Madrid; you'll be able to eat something." She smiled as they stepped off the boat, side by side. Kat saw Shadowsan rent a car that would take them all the way to Madrid. She placed her 'bag' in the backseat, sat shotgun and drove all the way to the center of the city. He began driving all the way to Palos de la Frontera, onto Plaza Autoridad Puerto Huelva, then a right turn to Polìgono Nuevo. As they drove, Kat stared out the car window, seeing life pass her by. She took pictures of Seville, and the landscape of how beautiful Spain is, even though they were nowhere near Madrid, but every passing second was an adventure; one she was ready to explore.

The entire trip took a day and three-quarters, seven hours, twenty-three minutes, and sixteen seconds, but - overall - it was worth it. Shadowsan and Carmen arrived, exhausted and mentally drained, at the heart of Spain. Madrid: the capital city where it's historically and, culturally, significant. Led by Emir Muhammad I of Córdoba, it was established in the second half of the 9th Century, during the Middle Ages, to an Islamic Northern Moors group. He built a fortress near the Manzanares River (which he ordered one of many to be constructed), in between the borders Al-Andalus and the Kingdoms of Léon and Castile; his prime objective was to protect Toledo from Christian invaders since Toledo was the capital of Spain at the time. From then on, it kept changing between Christian and Muslim hands several times, until in 1085, King Alfonso VI of Castile moved the capital from Toledo (after it got destroyed and conquered by the Christians) to Madrid, where it maintains the epicenter of government, politics, art, culture, fashion, music, and business in the European Union (EU).

After five hours of driving, they finally made it to Madrid. Some left and right turns down the road; then continued going in a straight line, and soon enough, the house was in plain sight. It was a modest three-story, Tuscan-style detached house. The entire 10,000 square meters of the property has a sprawling, front and back yards, Tuscan-style landscaping enhances the overall style of the house, and best of all: complete privacy from any nosy neighbors and visiting tourists. Only 8 km from the actual city, this mansion is the perfect place to train, live, and prepare for taking down V.I.L.E. Kat stepped out of the car with her jaw on the floor after seeing the enormity of the house.

"Welcome to my home, Carmen," he welcomed her. Her eyes sparkled at the beauty of it; the house is beautiful and warm, just like him. "Come in, come in. We have much to discuss as well as to contact Player that we arrived." Shadowsan popped the trunk open, and she grabbed her bag, heading inside the house. As they entered the door, the entrance hall bathed in light. Seven feet tall ceilings with lots of windows on the entire mansion, making it open and relaxing. The whole appearance was decked out in white marble and tile, bringing out the Italian theme together. On one side, there's a grand staircase that leads to the second floor of the house, which Kat took advantage of. Racing up the stairs, she began to observe everything: the guest rooms, her room, looking over the backyard through a window, and a separate corridor and wing for live-in staff. Going down, she saw the indoor heated Italian-style swimming pool, the conservatory greenhouse complete with hot tub, the gym, and spa, as well as the tennis court outside, the two car garage, and the various living rooms for both staff and owners. The gardens were her personal favorites: walkway cobblestone paths, beautiful trees curved to look like a canopy, flowers of all kinds planted around, and a manicured green lawn that looks soft and ethereal. She went back to the main living room on the left where Shadowsan waited for her.

"This is your house?" The ex-V.I.L.E. student commented. He chuckled at her childlike wonder and awe at his mansion.

"This is one of my three houses, but it's the closest to the city, and it's isolated but inviting whenever I have visitors," he said.

"What about the other two?"

"One is my safe house, in case V.I.L.E. is found out and destroyed, and the other is my vacation house. I bought it before I joined V.I.L.E., which I use for whenever I have business in Spain," he admits.

"This is awesome!" exclaimed Carmen. Shadowsan smiles, as he gestures her to follow him, which she does. He leads her to a room for her to stay in during this moment. The master bedroom was elegant in its simplicity. Giant bay windows that overlook the entire backyard and gets the morning light. A beautiful master bathroom in the adjoining door with marble countertops, stainless steel fixtures and faucets, a porcelain bathtub, and tile walls. The cabinets, made of a light wood, which enhanced the beauty of the bathroom. In the middle, there's a large, white chaise while on the other side, large French doors that lead to the walk-in closet (which was incredible, by the way). Shadowsan was happy that his student is happy and free, just as he wanted her to be.

"Come down to the kitchen. I did promise you there would be food," he said. Kat perked up at the mention of food right when her stomach began growling with hunger. Her cheeks turned pink at the sound, but he didn't mind.

"Yes, you did," she said. Shadowsan waved her over to follow him towards the kitchen. Walking down the staircase, down the hall, and made a right turn, both teacher and student reached the kitchen. All stainless steel appliances, and marble countertops. French-styled mahogany cabinets and drawers, and a comfortable dining room to talk and eat. Shadowsan pulled some ingredients from the fridge and placed them on the counter.

"So, now that we've escaped V.I.L.E., what's our next move, Shadow?" This question was something he was waiting to be asked, for a while.

"Now that we have the V.I.L.E. data banks, we need to stay one step ahead of them from here on out," Shadowsan instructs Kat. As he chopped up vegetables, she sat in contemplation for the whole 'taking V.I.L.E. down' plot.

"I agree. However, we can't keep the data banks here; if one of us were compromised, then everything that I've done: the escape off the island, knocking out Ms. Booker, taking her identity, stealing her boat, and the final two data banks, will be all for nothing. This operation will be over before it starts, and I refuse to let that happen," Kat argued strongly. "And besides, inside these V.I.L.E. data banks are some pretty hardcore encryptions, which would take us a while to crack. And that's where Player comes in." Suddenly, she remembered her friend.

"Oh my god, we forgot to call Player back about reaching Spain!" Kat said. Shadowsan gave a smirk that told her she was in trouble with her new friend.

"Your phone's on top of the desk in your room, charging. Let him know you're alright and we'll begin with our plan," he said. Kat rushed to her room, to see the phone, charging, on top of the desk, just like he said. Kat pulled the plug, grabbed her phone, and raced back down to the kitchen for her food as well as her plan to stop the crime organization she grew up in, and devoted a decade of her life that stole her from her family.

Returning to her stool, on a straw placemat was a plate of potatoes, meat, and rice with a bowl of salad nearby. A smaller plate with a bread roll, a pat of butter on the side completed the look. A wire basket with two bottles of olive oil and apple cider vinegar, along with a salt-and-pepper shaker in front. A glass of water with a slice of lemon inside and a napkin near the left side of the table finished her whole meal; just staring at it made her hungry.

Kat placed her phone down, began cutting up her meat, and pressed the 'Call Back' button on her phone. Suddenly, the phone started to ring. In Ontario, a twelve-year-old boy, sitting in front of five screens in his room, wearing a light blue t-shirt, jeans, sneakers, and a white baseball cap over his short, brown hair. His eyes were a grey/brown combination that set off his caramel complexion. He just sat back on his chair, relaxing and placing his feet on top of his desk, when a sharp RING! snapped him out of his relaxation time so much, Player fell backward and off his chair.

"Honey, are you alright?" his mom asks. Player's mom looks just like him, except for his eyes: caramel-colored skin, brown hair, white teeth, thin lips, high cheekbones, and a firm, but slim figure.

"Yeah, I'm fine. My phone scared me, that's all," he replied.

"Who's calling you?" Player looked at the Caller ID and saw it was his favorite girl: Carmen.

"One of my friends. We began pen-palling each other through email, so she gave me her number. It's afternoon in Madrid, so she's excited to talk to me about it," he explained. Player didn't like lying to his mother, but if she ever found out that he was helping two international thieves in bringing down a major secret criminal empire, pretty sure - he'd be grounded for life.

"Oh, well, tell your friend hello from me."

"Will do." As she closed the door to his room and headed downstairs, Player breathed a sigh of relief. Now that he's alone, he picked up his phone, connected it to his Bluetooth headset, and answered the call. The beginning of Team Carmen was taking form...and it all started with a phone call among best friends.

So, here's the first chapter of my Carmen Sandiego/Kim Possible crossover fanfic, it's an unusual friendship between Carmen and Player. But, we never talk about how the data banks were sent, the gadgets she has, etc. So, I thought I could explain it a bit further in depth. Also, there are three houses in Madrid that I used, and it will be posted on my profile page (as soon as I write something down in it) for all of you to see as well as her face claim. It took a while to finish it, but I'm very proud that it's a great success so far and can't wait to write more chapters about it. The conversation about Kim Possible will happen in the next chapter, so don't worry. And it'll be that much closer for the Poitiers job as well as the family reunion, so continue to be patient and don't forget to review, fave, and follow this story!

Also, most of the locations are when I used Google Maps to track down how to get to Madrid from the Canary Islands, so I thought it was a great way to showcase what 'Carmen Sandiego' was all about. Also, the history of Madrid took a lot of finding online through different websites on how it was founded, what happened, and how important it is to Spain as well (if I get anything wrong, let me know and I will immediately fix it).

The houses I'm using for Shadowsan's safe house, regular house, and vacation house, I found on a website. Somewhere in the future chapters, Kat will return to Spain, and she'll see said houses Shadowsan talked about. I'll post the site and links on my profile page as soon as I can.

Before she can return to Middleton, Kat will have to undergo training and tutoring so that she can function normally in the real world with her family. That's probably going to take place in the next chapter as well; they'll be going through a time jump in this chapter and the next one, to pick up the story and see where it takes off.

Anyway, thanks for reading and I'll start writing the next chapter and other adventure. It might be a little fluffy, but she's not ready to undergo her missions just yet.

Thanks for reading!