Hello all. I know you want more for Danny Phantom One Week Dress Up Sequel, but I have writers block for that story. I have read Danny Phantom/Percy Jackson and the Olympians crossovers but there is no Danny/Annabeth pairings, so this idea came to me one night for that pairing. Danny and Percy will be brothers separated at birth. Danny will be getting his ghost powers 2 years earlier. On with the story.

Poseidon is standing on a beach in New York with his mortal wife, Sally Jackson, his brother Zeus, and his two sons, Percy and Danny. "I'm sorry brother but your sons are to powerful together. They need to be separated now before their bond becomes too great." Zeus says. "I know brother, but who will take one of them?" Poseidon asks. "Apollo's daughter Maddie and her husband Jack, who is a son of Hephaestus, have a two year old daughter who wants a little brother. They would be willing to take one in." Zeus says. Sally says, "Please leave me with Percy and send Danny away Lord Zeus." Zeus says, "Ok Sally Jackson." With that Danny Jackson is separated from his older by 2 minutes brother Percy and his mother.

Time skip: 12 years later: Danny's POV:

Here I am sitting in my room with my two best friends, Sam and Tucker, when my dad yelled up. "Danny, can you and your friends come down to the lab?" "Sure dad." I reply. The three of us head down to my parents lab. Jazz is there looking annoyed as usual when its ghost related. "Feast your eyes on the Fenton Ghost Portal kids." Mom says. "Banzai!" Dad shouts when he plugs it in. The portal sparks and fizzes but goes out in the end. Mom and dad look so down. They are about to go upstairs when I stop them, "Wait! It could be a loose wire in the portal. Let me check it out." I don the hazmat suit that was made for me. I walk into the portal to see what is wrong with it. I'm using the wall to guide me because it is dark when I hear a click. I look to see what it was when I see the on button. I don't make it out in time and get electrocuted. When I stumble out, I immediately pass out. When I wake up, I see the shocked faces of mom, dad, Jazz, Sam, and Tucker staring at me. "Why are you staring at me?" I ask. "Dude you might want to look in a mirror." Tuck says. I do and I freak. "I'm a ghost! I can't be a ghost. Oh and BTW, who thought it was a good idea to put the on button on the inside, mom, dad?" Suddenly a white ring appears at my waist and splits going up and down my body returning me to normal. Mom asks, "Sweetie can we run some tests?" "Sure mom." I say. Almost immediately dad pulls a needle and draws some of my blood and run it. "Danny-boy it looks like you became a half-human, half-ghost hybrid, formally called a halfa. The only other one we know is Vladdie. And he got that way after our proto-portal in college. We can call him and ask him to help train you with the basics and go from there." Dad says. "Ok." I reply.

Vlad's POV:

I was just sitting in my mansion in Amity Park when I get a call from none other than my brother from another mother Jack Fenton. "Yes Jack, what is it that you need?" I ask. "Vlad, do you think you think you could come and teach Danny about his powers? He went through almost the same thing that you did. He was in our new and bigger portal when he hit the on button and got the exact same condition you have." Jack asks and explains. "I'll be right there." I reply. I go ghost and fly right to the Fenton house.

Time skip: three weeks: Danny's POV:

It has been three weeks since I became a halfa, and Uncle Vlad started training me. Currently my history class is traveling to the Metropolitan Museum in New York City. We will be part of a group from Yancy Academy for a tour. We are assigned partners from Yancy. My partner is a boy by the name of Percy Jackson. When we reach the museum and find our partners, I immediately see a boy who looks exactly like me. He says, "Hi my name is Percy Jackson. I'm supposed to be your partner. I feel like I met you before." "I'm Danny Fenton. That's cool. I have the same feeling."

Percy's POV:

As Danny and I are hanging out, I ask him about his family. "So Danny, what does your family do for a living?" "Well my parents are ghost hunters. My sister wants to be a psychologist. And I wanted to be an oceanographer. Every year we go to the beach I always feel so calm in the water." He says. "I never knew my dad, my step dad is a leach, and my mom works in a candy store at Grand Central Station." I tell him. Suddenly Ms. Dobbs comes over and asks us to follow her. We follow her into a part of the museum that's under construction. Next thing we know some weird creature attacks us. Then I see Mr. Brunner with Danny's history teacher, Mr. Lancer. Mr. Brunner tosses me a pen while Mr. Lancer tosses Danny a coin. Danny flips the coin and a sword made of some type of bronze appears. A sword made of the same material appears in my hand when I click the pen. Both Danny and I work in sync like our minds are connected and chop off the creature's head and it turns to dust. Once outside I give the pen back to Mr. Brunner and Danny gives the coin back to Mr. Lancer.

Time skip: 2 hours: Fenton's Hotel Room: Danny's POV:

After arriving back at my parent's hotel room, I say, "There is something strange in this city. There was some strange man following." Mom and dad visibly pale at that. Mom then calls Mr. Lancer.

Maddie's POV:

"Hello Mr. Lancer? Yes I need you to take Danny to Camp." I say to Mr. Lancer. "Ok Maddie. Keep Danny safe, I'll be there soon." Mr. Lancer says. What I didn't know was that Danny over heard my conversation.

Danny's POV:

"Mom, what's this camp you are having me go to?" I ask. "It's a place where you will be safe sweetie." Mom says. A few minutes later, Mr. Lancer shows up and leads me to his car. He takes me to a farm road where we follow a car until it crashes. We help the people out of it. One of the passengers happens to be one I know. "Percy?" I ask. "Danny? What are you doing here?" He asks me. "Mr. Lancer is taking me to some camp. What are you doing here?" I explain. Suddenly I get enveloped into a hug from the woman with Percy. "Oh Danny I haven't seen you since you were a baby twelve years ago. I'm your mother." The woman says. "Mom, are you saying that I have a brother?" Percy asks the woman, whose name I learn is Sally Jackson. "Yes Percy. You and Danny are twins. You were born two minutes before Danny." Sally, aka mom, says. Mr. Lancer says to the other boy, "How have you been Grover?" Grover says, "I've been fine William. How about you?" Mr. Lancer says, "Same." Then some roar sounds and we start running. We make it to the top of some hill with a pine tree when mom gets grabbed by none other than the Minotaur and it crushes her neck. Percy and I work in sync again to take down the Minotaur. Once it was defeated we run over the hill to get help.

Time skip: however long it was in the book that Percy was out: Danny's POV:

Percy was laying on a bed in some kind of a room. I wasn't as injured as him but I stayed by his side. When he woke up we were greeted by the same girl that took care of him, it seems that every time I talk she ends up giggling. I think that she likes me likes me. Both of us are 12 so we can't date. But she is still cute when she giggles. She leads us to meet Mr. Lancer, Mr. Brunner, Grover, and some other man. Mr. Lancer and Grover aren't wearing pants and have goat legs. "Mr. Lancer, you're a satyr?" I ask. "Yes. I was assigned to protect and demigod or half-blood as they are sometimes called. You were one such person Daniel." He says. Mr. Brunner then stands up from his wheel chair and I recognize him as Chiron, the legendary trainer of heroes from Greek Mythology, the one who trained who trained Hercules or Heracles.