Scooby and the gang are based on the way they were originally drawn in Scooby-Doo, Where Are You! (only with the production value of today) in the dream, which makes sense, because the episode is based off the old Hanna-Barbera cartoons of that time.
Lord Infernicus: "That's Lord Infernicus! Get it right, sidekick! Aha ha ha ha!"
Scooby: "We're trapped"
Lord Infernicus: "Time is running out sidekicks! Of course, you can always give up!" (Lord Infernicus vanishes)
Captain Caveman: "Flaming man gone."
Jabberjaw: "Yeah and so is the woo-woo-the Funky Phantom. What do we do now, Scooby-Doo?"
Scooby: "Only thing we could do; solve this mystery before it's too late."
— Scooby, Jabberjaw and Capyain Caveman chased by Lord Infernicus '
Principle Quinlan: "Tonight's mystery is..."
Lord Infernicus: "You're doom! (everyone sees Lord Infernicus) I am Lord Infernicus and there's been a little change in plans! Aha ha ha ha ha!" (everyone screams and Infernicus captures everyone with a burst of flame except for Quinlan, Dynamite, and the sidekicks)
Jabberjaw: "Hey, where is everyone?"
Jonathan Wellington Muddlemore: "Boo?!"
Captain Caveman: "Onga bonga?!"
Speed Buggy: "*Phs phs pshs* Huh?"
Lord Infernicus: (reappears) "Your friends are hidden somewhere in this building. All communication with the outside world is cut off. If you try to leave or call for help, you'll never see them again! You have until sunrise to find them. GOOD LUCK! AHA HA HA HA HA HA HA HA HA!"