Danny Fenton and Diego Martinez we're just 14 when Danny's parents built a very strange machine That was designed to see a world unseen. When the machine didn't work, Danny and his friend went inside and the rest is history.
The episode opens with a scrolling shot of a row of townhouses and transitions into the Fenton Works basement. Jack, sitting down and wearing a soda hat and a fishing vest, sips his soda, then casts a glowing-white fishing line into the open Ghost Portal. Diego comes down the stairs and drops Danny's backpack on the floor as he walks up behind Jack.
Diego: Holà Mr. Fenton, What are you doing?
Jack: Diego. Keep it down, You'll scare away the ghosts. *Points to his fishing pole.* It's the Fenton Ghost Fisher. I'm Fishing for ghosts.
Jack stops reeling and stretches out the line a bit.
Jack: Check out this line. Coated with a special high-test ectoplasmal resin that ghosts can't break. Quiet now. Don't wanna spook 'em.
Jack recasts the line and sips his soda. Suddenly, his stomach rumbles.
Jack: Whoa! That soda goes right through you like Sherman through Georgia.
Diego: Who-
He gives the Fenton Fisher to Diego and goes upstairs.
Jack: Here! Hang on to this. I'll be right back after I use the Fenton Urinal.
Diego: The what!?
The fishing line suddenly reels out further into the portal and becomes taut. Diego's ghost sense goes off.
Diego: Aw man.
Diego strains to keep a hold of the Fenton Fisher against the resistance, but the line breaks. A blue ghost dragon Princess Dorathea, emerges from the portal, the line hanging from her mouth. She roars and the line's broken end smacks Diego in the face.
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Diego: Ja-
Princess Dorathea: I want to go!
Diego:
Diego runs away, terrified. Dora grabs him in her fist.
Dorathea: I have to go!
Diego: You'll have to stand in line behind Mr. Fenton. In the meantime...
Diego then goes ghost. He becomes a blue ghostly mist to escape Dora's fist and reforms. Surprised, Dora tries twice to hit Diego, before breathing green fire at him, all of which he dodges. He returns with a kick, which sends her flying across the room, during which her golden amulet falls off her neck into Diego's open backpack. Upon landing, Dora transforms into a ghost girl.
Dorathea: All I wanted was to go to the Princess Costume Ball. And my horrid mummy won't let me!
She wails as she flies back through the portal. Diego changes back to normal sighing in relief.
