In a control panel filled with symbols, each representing a different dimension, the princess of minotaurs is about to face off against an ogre.
"In every realm of the multiverse, Princesses keep their kingdoms safe and the bad guys at bay!"
And then she gets effortlessly plummeted to the ground. "...Except when they don't."
Suddenly, the princess is replaced by Marco, who is now in her body.
"And that's where I come in!"
He grabs the mace and effortlessly swings it, sending the bad guy into outer space. He then returns home and starts singing before quickly switching between the mermaid princess, pixie princess and four-armed princess.
I replace princesses every day, it's my job.
Rule a kingdom, save my people, and return home.
She goes through more princess, each showing something, before he packs and loads himself to fight bad guys.
Permit laws, be formal, make kids happy, save them all!
I am ready! Watch out bad guys! Here I come!
The choir sings:
Slashing, swinging, shooting, flying, tricking, monster-kicking!
Then, back at Mewni, Star runs before passing through a portal and turning into a flying insect-mewman hybrid, which Marco uses as a ride.
"And I got Star sticking at my side!"
Then, with Ludo and Buff Frog, they go through the portal and Ludo becomes an exterminator using an insect hybrid Buff Frog as a ride.
"No nobody's going to stop..."
Ludo and Marco jump off their vehicles, who start to fight each other as Marco karate kicks Ludo.
Marco Diaz: Part-Time Princess!
A dimension cut happens and Marco and Ludo are now using giant robots, getting ready to attack each other.
Marco Diaz: Part-Time Princess!
In another cut, Marco is now next to the title of the fic, singing with the chorus.
Marco Diaz: Part-Time Princess!
"Marco Di-aaugh!" Marco says before being teleported away.