READ BEFORE READING FANFIC!!!

-Runs hands through hair- Okay, I know you guys are used to me not finishing fanfics. I understand. –Tomatoes are thrown- WAIT! I have something to say! This fanfic IS finished and WILL be complete! I have all the chapters typed up and ready for your eager eyes, but you have to REVIEW first, okay? This is not a normal Danny Phantom story! This is a Phineas and Ferb and Danny Phantom crossover that is finished. So review if you want updates, or NO UPDATES FOR YOU!

I do not own any cartoons, characters, or copyrighted things in this or any of my fanfics.

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All was quiet in Amity Park. The skies were grey but rain had not yet come. The humidity was high, so no one was outside to ruin the sweet silence. Danny Fenton, a junior in high school and the resident ghost-fighting superhero 'Danny Phantom', sighed happily and sank into his blue bean-bag chair, enjoying the rare silence he was being treated to this fine summer afternoon.

"Ha ha ha! My universe transport-inator is a success! Now I will conquer this tri-state area while I send you back to Danville!"

Danny groaned at the interruption of evil laughter. He had no idea who the person was talking to, but he had shattered the precious silence and he was going to pay.

Without uttering his normal battle cry, Danny stood and two white rings appeared around him, one going up and the other going down, to change him into Danny Phantom. The spandex suit fit his trim body like a glove, and his now pearl white hair fell into his grim neon green eyes. A sadistic smile curved his face. Oh, if it was the box ghost, he was going to hurt tomorrow…

The ghost boy quickly phased out of his room, fists clenched and ready for action. What he saw stunned him.

A crazy guy in a white lab coat was defending himself against a platypus in a brown hat who was using martial arts against his rival-and winning. A large metal machine was laying in the middle of the road, close to where they were battling, and Danny raised his eyebrows in amusement and confusion. After glancing back at his room wistfully he sighed and proceeded to fly down to the scene with the curiosity of a cat.

"You cannot defeat me-!" The man shouted in his strange, gravelly voice just as the teal platypus roundhouse-kicked him across the face and sent him slamming back against the machine. Then he spotted the ghost boy, hovering a foot above the ground with his arms crossed. The strange boy raised one ebony eyebrow. "Uh, hi."

There was an awkward silence when the two shifted their eyes over to Danny, and then the lab coat man spoke.

"Is he from your agency like that dumb Double-00 spy?" The man questioned the platypus. To Danny's amazement, the platypus shook his head and glanced at the halfa with surprise.

"I didn't think so." The man muttered. "He's not an animal."

"Okay, what is going on here?" Danny demanded, lighting up an ecto-ball in the palm of his hand menacingly.

"Ooh, you want to hear a back-story?" The man asked eagerly, and the platypus dropped his head with a strange sound of resignment. With that, he plopped down near the machine and put his bill in his paw, looking expectantly up at the two humans.

"What-" Danny began in utter confusion, but the man interrupted.

"Well, if you must know, I am Doctor Heinz Doofenshmirtz, the most evil of all evil geniuses in the tri-state area." The man proclaimed, but then seemed to reconsider. "Well, in the tri-state area of Danville, that is." He corrected himself.

Danny put a hand to his mouth, stifling his laughter. "Doofenshmirtz?"

"What?" Dr. Doofenshmirtz asked defensively. "It's a good, strong name!"

"Okay." Danny shook his head, laughter clear in his voice.

"Anyway," The doctor said, glaring at the hovering boy, "Perry the Platypus and I are not from your universe. You see, I am an evil genius and Perry the Platypus is my nemesis who comes to stop my evil plans. Today I came up with an ingenius idea-" He laughed manically. "The universe transport-inator!"

Danny and Agent P looked at each other out of the corners of their eyes.

"You know what, Perry the Platypus-!" Dr. Doofenshmirtz reached over to pull a trap out of nowhere, but realized he wasn't in his lab. "Oh, dang."

With a malicious smile, Agent P kicked him back against the machine, making it whirr and sputter, and finally disappear in a starburst of light.

Perry made a distressed sound, jumping to catch the disappearing invention, but it was too late, and he was stuck in Amity Park.

--

"Sam, I need you to come over here."

Sam Manson sighed, brushing back a tendril of black hair from her face as she cradled her phone against her ear. "Why, Danny? I just got back from the book store."

"It's got to do with an animal." He tempted her, and her eyes lit up.

"I'll be there!" She concluded, and proceeded to jump on her newly redesigned violet scooter.

--

"Sam!" Danny immediately jumped on her when she walked through the door, surprising her. "Woah, Dan!" She cautioned, holding out her hands. "What's the problem?"

"Him!" Danny pointed to an adorable, mindless platypus lounging on his bed. Sam nearly gasped at his cuteness. But of course she couldn't, seeing as she was a Goth.

"Oh, he's adorable!" She breathed, rushing forward to cradle the platypus into her arms. She looked up at him, her amethyst eyes shining. "Where did you find him?"

Danny refused to admit that his heart skipped several beats at the look she was sending him. "That's not an ordinary platypus." He responded, leaning his hip on the side of the mattress.

The Goth looked up at him, raising her eyebrow. "No platypi are ordinary, Danny." She responded with amusement in her tone.

"Well I mean he's really-Wait, did you just say platypi?"

Sam chuckled. "The plural of platypus." She stated matter-of-factly.

"Whatever." Danny shook his head. "That's not an ordinary platypus." He leaned in closer as if he didn't want someone to hear them. "He's…" He paused, looking around, then continued. "-A secret agent from another universe."

He pulled away from her bubble and looked down at her expectedly. She blinked up at him.

"…Danny, did you take your happy pills this morning?"

"Sam!" Danny groaned, face palming. "I'm serious!"

"Danny, this-" She held up the platypus by the underarms. "Is a platypus. A mindless animal that doesn't do much other than eat and sleep."

He chattered and Sam laughed, hugging him close. "Oh, you're adorable!"

Danny rolled his eyes. "He's a secret agent! He has a hat and a nemesis and everything!" He cried, throwing his hands up in the air.

"Show me the nemesis." Sam dead-panned. Danny rubbed the back of his neck.

"Well, I sort of sent him back on his universe transport-inator by accident. That's why I need your help."

Sam blinked again and Danny was infuriated how she made him feel so stupid. "His…universe transport-inator."

"Yes!"

She placed Perry on the bed and stood, placing her hand on her friend's forehead. "You don't feel warm…"

"Sam, I'm serious! I'll make him show you!" He shoved her hand away as she gurgled with laughter. "Perry, please show Sam your secret identity."

Perry responded with a mindless chatter.
"If you want to get back to your universe you'll need to show her. We won't tell anyone."

"Danny please-" Sam reached out to touch Danny's shoulder, but she became frozen in place when her eyes locked on the now-standing platypus with the brown detective hat on, who was looking at her with an expression that showed mistrust. Not so mindless after all…

"Sam?" Danny asked worriedly. "Are you okay?"

"Okay, is this some kind of sick joke that you ghosts are trying to play on me?" Sam cried, holding her forehead in her hand. "Because it's not funny!"

"Sam!" He grabbed her by the shoulders. "I'm telling you the truth!"

Sam closed her eyes and breathed deeply. "Okay. Tell me the whole story."

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