Ben stared at Waldo, who was now a cow.
Meanwhile, the pink monster ran back toward the soccer field.
The teachers were still trying to catch the spider.
"Whoa!" shouted Mr. Freaky as the pink monster accidentally knocked him over.
Mr. Freaky climbed back to his feet.
Then—shloomp! Ben floated straight through the principal.
"Ouch!" cried Mr. Freaky. "What's going on here?"
"That pink monster is the one who's trying to ruin today's field trip!"
Ben shouted over his shoulder.
"Oh no!" cried the principal. "We have to catch her!"
Mr. Freaky ran after the monster, and other teachers joined in the chase.
Mr. Gwarg ran fast and tried to grab the monster.
Suddenly—poof! There was a puff of smoke, and Mr. Gwarg was blown backward.
The monster turned blue and got away.
Miss Bungle had nearly grabbed the monster's hood when bright light flashed and the monster disappeared.
When the monster reappeared farther down the field, she was a green ogre.
"This is a disaster!" cried Mr. Freaky.
Just then Ben heard the sound of rushing wind.
He looked up and saw Winnie on her broom, ripping through the sky like a rocket.
The witch weaved in and out of the crowd and toward the spider.
The spider shot webs at Winnie, but she caught them with one hand.
She flew in a circle around the spider, letting one strand of web wrap around the creature's legs.
The spider fell over, unable to move.
Next Winnie shot across the field, toward the green ogre.
The ogre tried to run away, but Winnie flew like lightning.
She flung the web and the ogre was caught.
"Excellent flying, Winnie!" said Miss Bungle.
Winnie beamed.
Everybody ran over to the ogre.
Ben noticed that she was starting to change shape again. She grew thinner.
Long black hair grew from her head.
Everybody gasped.
"Deb!" cried Mog.
"Deb?" Mr. Freaky stared at her.
"I don't understand. Why were you trying to ruin the people's visit?"
Deb hung her head. "I wasn't trying to ruin it.
But when the humans arrived, I started feeling weird.
Then strange magic kept happening.
I tried to talk to Waldo in the lab, but he didn't even recognize me.
When I saw my reflection, I knew why."
"That human was you?" said Waldo.
Deb nodded. "I turned back into myself for a while.
But then I turned into a bunch of other monsters."
She looked at Mrs. Germ. "Why is this happening to me?"
Mrs. Germ held out a hand. "Come to my office, dear.
We'll get this all sorted out."
The next day Ben was sitting with his friends at lunch.
Mog and Deb were there.
Gaby and Waldo were there too. Waldo wasn't a cow anymore.
"Luckily the spell didn't last long," said the wizard.
"I was back to normal by dinner."
Winnie came over to the table and sat down.
"When are you retaking your test?" Ben asked her.
Winnie shook her head. "I'm not retaking the test."
"What?" Ben was alarmed. "Why aren't you retaking it?"
Winnie grinned. "Miss Bungle said that my flying yesterday was the best she's ever seen.
I earned my broom flying license!"
"Awesome!" said Ben. Waldo gave her a high five.
"I have some news too."
Deb, who'd been sitting silently with the group, suddenly spoke up.
They all looked at her.
Deb's voice shook a little. "I found out yesterday that I'm not a ghoul.
I'm a doppelganger. I was adopted when I was really young.
Since everyone else in my family is a ghoul, I took on that form at first.
My parents had no idea either."
"Wow," Winnie murmured softly. "That's big."
"You never changed form until yesterday?" asked Waldo.
"Nope," said Deb. "I didn't understand what was happening.
I also have magic powers. They kept going crazy.
I'm so sorry about everything that happened."
"It sounds pretty scary," Ben said.
He was always worried about learning how to float through objects.
But his problem seemed silly compared to what Deb had gone through the day before.
Deb was still explaining things.
"Mrs. Germ thinks that being close to the humans caused my change.
Doppelgangers like to make themselves look like humans.
So when I was near humans for the first time yesterday, everything started happening."
She looked like she might start crying.
"It doesn't matter," Mog said quickly.
"Ghoul, doppelganger . . . Either way, you're perfect, Deb.
You're so smart and . . ."
"Oh boy," Ben whispered to Winnie as Mog went on and on about how great Deb was.
"I know." Winnie grinned at Ben.
"It sounds like somebody is totally in love again!"
"Yeah," Ben thought, gazing into Winnie's pretty green eyes. "I am."