After years of fighting crime and being a hero, Danny decided that he wanted another profession, something else to do with his life. In the end he decided to be what he always needed: A doctor.
Thanks to Frostbite's teachings and help, Danny managed to become a successful and efficient doctor quickly (although he definitely hated normal medical school), with experience in all kinds of beings (from all kinds of dimensions, he couldn't just be a human doctor, what's the point on that?)
Since his universe didn't need a doctor for heroes and Frostbite was enough for the ghosts he decided to... be a traveler doctor, or something similar, help other dimensions. With the help of the Infinite Map he always traveled where "he was needed", and thanks to Clockwork he always escaped before they could question him.
The Justice League was very confused about who was randomly showing up to heal them. Sometimes by force. But Danny didn't care about the consequences, after all, they need him. And it's kind of funny that he's referred to as "The Doctor" in their files.
Im crying this is so god d* funny.
Is this weird dude; who’s always showing up and saving our lives and giving medical care we otherwise wouldn’t have been able to get, here to help us??? Is he on our side????
No. Maybe. Clearly this medic is dangerous and possibly plotting our downfall.
The level of self centered paranoia is immaculate. Just say thank you. I think after the third save it’s pretty obvious he’s just a mysterious Medic. Thats pretty ally like honestly.
@justwannabecat @memetic-trigger-hazard stop hiding your hot takes in the comments smh
Alright since I was called out and can't write anything fiction, collected everything and added some. feel free to build off these.
Danny saved Donald Wilson's life during WW2 when he was serving with the 43rd Wessex Division of the Scottish Rifles, which is noted to have taken heavy casualties. They become friends and Danny occasionally drops in because he was 'in the neighbourhood'
The portal shock happened on his right side and caused the position of his core to mirror his heart, which due to halfa biology 'pulses' at opposite timing to his heart.
Clockwork is the Master of Time.
Danny as his ghost (adopted?) son is granted the title of "Lord of Time" to go with his "Master of Space, High King of The Infinite Realms, all the Dead, Neverborn and Ancients." etc
He turns up and calls Diana niece.
While he stops Hades latest bullshit.
By reminding him that he's waiting on his paperwork.
Danny is in the Canon hieroglyphs and records as well as the DC ones because Egypt happened before the universe timelines diverged. Include him beating a young Ra's Al'Ghul for leadership of their master's school during the Infini-Map incident with Vlad. Ra's has never let it go. Danny calls him Fruit Loop Supreme.
The Fortress of Solitude has records of "The King of the Zone" who saved ancient krypton and who the Phantom Zone is named after (is the Phantom Zone just the Infinite Realms?)
The House of (Dani) El? Kryptonians did love genetic engineering, stolen or donated dna to cure a disease perhaps? Could be the basis for Kryptonian bs powers.
Krytopnite/Ectoranium?
Danny uses the spectre speeder as a form of travelling office for his King paperwork, as well as emergency 'field' hospital and engineering workshop. Because he has the Kings Castle as his haunt, he is able to make the speeder his "normal" haunt, which due to space powers makes it larger inside.
Grandpa Clockwork let Ellie in on the joke and she painted her Dad's car blue.
Danny went to a University in England due to the anti ecto acts and it affected his accent.
Amity Park is in Illinois. Midwest manners exacerbate the accents stereotype.
Danny still doesn't know the shows based on him.
OK since my previous post got more interest than expected and my ADHD brain kept running overnight, have some more. As always free for anyone to turn into a full story.
The amount of similarities between Dr Who and Danny Phantom are actually pretty funny when you think about it, and Danny would be the kind of guy to just casually let slip information on previous 'minor' events . If you combine that with misunderstandings and miscommunication. Well. Shenanigans ensure. Danny IS a gremlin. Dani comes by it naturally after all. The JL would freak out pretty quickly.
To list a few ideas:
Time Lords are taken to look into the Time Vortex on Galifrey. Sounds mighty like a portal accident to me.
The Time Lords of Galifrey considered themselves guardians of creation and the time stream. Hi there Danny doing missions for Clockwork.
The red robes that Rassilon and his fellow Time Lords have look very familiar. Almost like a certain group of eyeballs.
The Master. Vlad Masters. Just as much of a Fruit Loop.
From some older Who. The Valeyard. Implied to be a future evil incarnation of the Doctor. Sounds very much like Dan no?
The Doctor is known for changing his appearance. You could take this at the basic level of phantom/fenton or ramp it up with some shapeshifting. Dealers choice.
You could take the above even further if it's a very old and immortal Danny. Every time his human side dies his ghost side just makes a new body, ala regenerations. Bonus humour includes Danny having the Doctor's post regeneration cravings and drunken/high/concussed state. Due to ectoplasm's elasticity it could account for initial differences in appearance while he's not 100%in the brain meats.
A sonic screwdriver is exactly the kind of thing Danny would make. A multitool using ectoplasm for telekinesis to be the perfect fitting or attachment for whatever he's working on? A dream come true after the hodgepodge of his parent's inventions being made out of toasters and microwaves.
Intergalactic treaties? Planetary Defence Pacts? Agreements to defend undeveloped worlds with primitive societies? Sounds like something Danny would be involved in as High King. After all, he oversees the Infinite Realms, the Omniverse which contains every instance of the multiverse, anything which threatens all his hard work and repairs after Pariah broke everything is certainly on his radar. Plus this boy loves space. No way is he passing on his chance to live his childhood dreams.
Meanwhile the Justice League is panicking, Clark is fanboying because he really associated with The Doctor growing up, Bruce is binging Dr Who desperately trying to get caught up (he's a Grey Ghost fan ok, he doesn't get why nobody else likes it) while he gets Tim and Barbara to write Cliff Notes versions of what they know about The Doctor from the TV shows.
Meanwhile Constantine is drinking. As an indicator of how bad things are, Zatanna joined him. Because it turns out that the TV wasn't exaggerating when they called The Doctor, The Lonely GOD.
Danny is just thrilled to meet such interesting and colourful new people. He's still not sure why they're so excited to meet a Doctor? Do superheros not have health insurance or something in this dimension? At least they're friendly. And they have a space station :D
Bonus:-Clockwork has played every incarnation of Rassilon in the TV series via overshadowing. Timothy Dalton was his favourite. He will not be taking questions.

















