The extended de-evolution chamber scene
Transcript from novelization
As seen below, Todd Strasser's film novelization has the most complete known description of how this scene likely played out, found on pages 57-61.
In the center of the de-evolution chamber was a silver chair. Above it was a device that looked like a space satellite. Toad was already there when Simon brought Luigi and Mario in.
"You think I'm scared?" Toad asked. "I'm not scared."
A guard threw them into the chair. Metal bands automatically clamped down on his wrists and ankles.
"Help!" he screamed. "Don't do it!"
A door opened and Koopa entered the room.
"You! Koopa!" Toad shouted. "You're a lousy king!"
Koopa shook his head as if he was disappointed. "One thing I cannot stand is naysaying. Simon!"
"Yes sir!" Simon snapped to attention.
Koopa pointed at Toad. "De-evolve him!"
Trembling with fear, Toad still managed to mutter: "Our old king--you thought you could get rid of him, but you couldn't...."
"See you later, alligator." Koopa waved at him. The chair slid backward on a track, and then slowly rose until it was covered by the large satellite device. Koopa turned to Mario and Luigi, who were still being restrained by the guards. "You may understand evolution as an upward process. Things evolve from primeval slime to single-celled organisms up to intelligent life."
As Koopa spoke, he walked toward a control panel. "De-evolution works in the opposite way...to simpler, less intelligent forms of life. Thanks to this machine, even our most restless citizens can become faithful members of my elite guard of goombas."
Koopa flicked a switch, and the machine around Toad began to glow and make a hissing sound. After a moment it stopped and the chair descended again. Where Toad had sat, now sat a goomba.
"Why did you do that to him?" Luigi shouted.
"Yeah," yelled Mario. "What single-celled organism did you evolve from?"
"Me?" Koopa smiled. "Tyrannosaurus rex, the lizard king, thank you very much. But though my evolution was wonderful and sweet, your de-evolution will be a living nightmare....unless you tell me where that meteorite piece is."
The brothers still refused to answer. Koopa smirked and turned to his newest goomba, whom a black-suited technician was helping out of the de-evolution chair.
"So loyal." Koopa beamed proudly. "So lethal. So stupid..." He patted the goomba on the shoulder. "Walk tall. Be proud. Go, goomba!"
Near him, the technician sneezed. Koopa pushed him into the de-evolution chair. "You're sick. You better sit down."
The metal cuffs automatically closed around the stunned technician's ankles and wrists
"We can't have you spreading germs around," Koopa said as he strolled back to the control panel.
"But...but...," the technician gasped in protest.
Once again the de-evolution machine dropped over the chair. With an evil smile on his face, Koopa turned to Mario and Luigi. "Millions of years of climbing up from the ooze, instantly reversed. Imagine the horror as it all slips away. It's worse than mere death. It's being undone."
The king turned the intelligence dial to Primordial. As the de-evolution machine hissed, Koopa's smile disappeared.
"You mammals stole our world," he ranted at the brothers. "Dinosaurs were the greatest creatures to roam the earth. Mammals were just shrews...mice. They didn't even dare peek out from under a leaf when the dinosaurs came by."
Koopa stared at Mario and Luigi. "One last time. Where is the rock?"
Luigi glanced at Mario and sliently shook his head.
The de-evolution machine stopped hissing and rose. All that remained of the technician was a puddle of greenish ooze. Koopa stared at the dripping mess in disgust.
"All right." Koopa nodded grimly. "Which one of you wants to go first?"
Mario and Luigi looked around. Simon was aiming some kind of ray gun at them. Goombas guarded the doors. There was no way to escape. The brothers stepped toward Koopa at the same time.
"I'll go," Mario volunteered.
"Take me," said Luigi.
Koopa narrowed his eyes.
Suddenly Luigi nodded at Mario, and together they pushed the king into his own de-evolution chair. The restraints automatically slapped down on Koopa's ankels and wrists, and the de-evolution machine began to drop.
"You're going back to where you came from, lizard!" Mario shouted triumphantly.
"Help me!" cried Koopa, now sitting in the puddle of primordial ooze that had once been the technician. Simon and the guards dashed toward him. In the confusion, Mario and Luigi escaped out the door.
"Get this filthy gunk off my!" Koopa screamed. "Get those plumbers! Draw me a bath!"
Simon managed to turn off the de-evolution machine and help Koopa out of the chair, but not before the de-evolution process had begun. There was a glimmer in one of Koopa's eyes, and for a moment the skin around it became scaly and reptilian. Koopa slapped a hand to his eye. "I'll kill those plumbers," he growled.