Chapter 4:
Shaggy and Scooby were going for a walk. "Hey look," says Shaggy, "it's the Museum of Natural History! Like, I like how it looks like a medieval castle! Makes me feel like I've gone back in time! Pretty cool!"
Scooby sees it and realizes that's the castle he was in and that was when he remembered he was supposed to get help, so he drags Shaggy into the building with him, with Shaggy screaming.
...
They're in the castle. "Like, what was that about," asks Shaggy.
"Rere's ra ran rin here ro reeds help," says Scooby.
"What are you trying to say," asks Shaggy. The Black Knight appears behind him and Scooby tries to tell him. "Dude, I still don't get it… wait… is there a scary-looking dude right behind me?" Scooby nods. Shaggy turns around and sees the Black Knight.
"Who are you," asks the Knight.
"Just some regular museum-goers," says Shaggy, "bye!" Shaggy and Scooby then run and the Black Knight follows them.
...
Shaggy and Scooby hide in the Egyptian wing. Shaggy disguises as a mummy while Scooby disguises as Anubis. The Black Knight enters and starts opening coffins, but before he could reach the last one, Shaggy and Scooby already leave.
...
The two then enter the dinosaur exhibit and hide in a brachiosaurus skeleton. "Scoob," says Shaggy.
"Reah," says Scooby.
"Are we hiding in a skeleton," asks Shaggy.
The two realize their mistake and the Black Knight enters and sees them. Shaggy and Scooby then run and the Black Knight follows.
...
Shaggy and Scooby then enter the medieval wing. "Careful," says Shaggy, "we're in his turf now!" The two walk. They see many suits of armor. But one moves. It's the Black Knight.
"Get out!"
"Why didn't you say so," asks Shaggy. The two then jump out a window…
...
Shaggy and Scooby are running. "Why did you drag me in there," asks Shaggy.
"Recause rere's ra ran rin rere ro reeds help!"
"Okay, that is clearly not barking," says Shaggy, "you're actually trying to talk! But I can't figure it out… wait… maybe Velma can! She's smart and she's interning for Oliver Jordan! Let's go!"
...
The Black Knight watches as they leave.