Meanwhile, back at the ranch...
Frostbite of the Far Frozen decided to pay a visit to the Great One™'s home to see how he's doing, and also welcome his family to 'the club', as it were. When he realized that Danny wasn't there (he was still at Clockwork's), he made for the portal in the lab, and it was at that point when he realized why he'd never been here before: the journey was just too damn long! He was used to generating a portal that would take him directly back to his lair, like any other ghost was able to do. The Fenton Portal opened up to a fixed location, the same one every time. Danny arrived just as Frostbite was finishing his explanation to Jack, Maddie and Jazz.
"...and that's why you've only met evil ghosts apart from me, Clockwork and...ah, Great One™!" said Frostbite, acknowledging Danny's presence, "Nice to see you again in one piece. If you don't mind, I'll be leaving now."
And he did. Danny felt better about himself, but at the same time, confused as to what was going.
"Hi, Great One™!" said Maddie, teasingly.
Jazz, much more mature than their parents, floated toward Danny.
"I see you've all met Frostbite," admitted Danny, "Now can I please ask what the hell's going on?"
"Frostbite was telling us that the Portal should open to more places in the Ghost Zone, so we don't always have to put up with the escaped convicts from the Ghost Prison," Jazz explained, "So that means the portal's going offline tomorrow."
"Portal off?" groaned Danny, "Ugh, I don't like where this is going..."
Jazz hugged him.
"Well, the other thing is that..." she sighed, "The whole school has joined the halfa movement."
"The...whole...school?" said Danny, pausing, "Even Sam?"
"Yes, even Sam..." Now Jazz was confused, letting go of the hug, "Honestly, I sorta expected a bigger reaction from you!"
"Clockwork taught me to deal with it. It could've been worse: somewhere in another timeline, there's a Danny Phantom strapped to the table by his parents. The thanks he gets from saving the world from the Disasteroid."
"So you're not worried about me and your parents and your friends being half ghost all of the sudden?"
Danny put a hand on Jazz's shoulder.
"Don't think about it, Jazz. Soon it'll be yesterday's news."
"...Fifteen minutes!" it dawned on her.
"Yes...how did you know about that? Senior thesis?"
"No," said Jazz, "Andy Warhol is here."
Danny turned in the direction Jazz was pointing. On a wall perpendicular to the portal's was the dead artist himself, applying a silkscreen of a giant TDK logo to a giant mural of Danny's DP insignia. Warhol floated back a bit to admire his work from afar.
"Gee," he said, then went back to work.
Danny's hand fell into Jazz shoulder, and he quickly pulled it away.
"Yeah...I need to work on that," Jazz admitted.
"Yes you do, Jazz," said Danny, "Yes you do."

The theme of the school prom focused on the fact that all the student's were halfas now. Everybody was in their ghost form, some in their everyday forms, others had their forms modified for formal occasions like the one tonight. Sam was no exception. Any other day, her ghost form turned her black shirt, hair and shirt into white; her purple scrunchie and oval shirt graphic changed to a green scrunchie and a stylistic, blocky "S" as her shirt graphic. But tonight, her ghost dress was light grey, which grew larger and circular as it went down, stopping at feet level with strips of fabric dangling from the bottom. She floated in the air in a way a jellyfish would float to the top of water. When she became a halfa, her parents moved out of town, leaving the manor in the care of her grandma. She felt it was for the best, as they'll probably come back in "fifteen minutes". (heh heh heh)
"You look adorable," said Danny in awe.
"So do you," said Sam.
They hugged each other, in preparation for the dancing to begin proper. DJing the prom was Todd Zeppelin, the greatest radio personality in the world. He put a record on the turntable, and prepared the tonearm. He was cool with it all: this whole half-ghost thing wasn't a bother for him.
"C'mon, I worked with aliens," Todd would say, "This? Child's play."
The Doors' "People are Strange" came blaring through the speakers, and soon the prom was in full swing. It almost sounded like Jim Morrison was in the room with them. It took the dancers a minute longer to realize that he was, singing along to a pre-recorded instrumental.
The music played into the night, and as the prom came to an end, the last song (and the slowest in the set) began to play.
And it came to a close the moment Danny and Sam shared a touching kiss.