Dora, the brave explorer girl with her backpack, and Boots, her monkey friend wearing red boots, venture inside the dimly lit house filled with glowing spider webs and floating sheets. Suddenly, a shadowy surprise attack from unseen forces makes them jump in terror, hearts pounding as they bolt out the door. "Boots, that was so scary! No one scares us like that—we have to run and get help from our friends!" "Yeah, Dora! Let's find Geo from Umizoomi super fast before it happens again—my tail is shaking!"

Dora and Boots dash to Geo's house, panting and wide-eyed, where tiny Umi figures buzz around a glowing toolbox. Geo, the math whiz with his trusty UmiTool, opens the door curiously, his orange body shining under porch light. "Geo, something scary attacked us at the haunted house! It came out of nowhere with spooky sounds and shadows—we ran for our lives and need your Umi skills to scare it away!" "Don't worry, Dora and Boots! With my shapes and numbers, we'll build a super plan to turn the tables and make that surprise run scared—let's team up right now!" "Yay, Geo! You're the best—show us those Umi moves!"

Dora, Boots, and Geo huddle as a shimmering mist envelops them, transforming them into ghosts, black cats, tigers, and skeletons, their eyes glowing mischievously like those in Mickey Mouse cartoons. Dora now a rattling skeleton with bony claws, Boots a sleek black cat with arched back, Geo a striped tiger with fangs bared. "Perfect! Now we're the scariest team ever, just like Mickey, Bubble Puppy, Mr. Owl, and the tiger and black cat—let's go haunt the haunted house, zoo, and parties!" "This is awesome! We'll surprise everyone and make them run—Halloween power activate!"

Dora as skeleton, Boots as black cat, Geo as tiger leap out with ghostly howls, startling Team Umizoomi friends, Minnie Mouse and friends, Bubble Guppies, and Franklin the Turtle and friends at the haunted house, zoo, and parties. Screams fill the air as the friends scatter in hilarious panic, tails tucked and ears flattened under the full moon's glow. "Meow-roar! Run if you dare—we're the ultimate Halloween monsters tonight!" "Boo! Did we scare you good? This is the best Halloween ever!"

The transformed trio advances with glowing eyes and rattling chains, making the surprise entity shriek and flee into the foggy night, tripping over pumpkins in its haste. "Math mission accomplished! Our shapes and scares sent it packing for good—high five, team!" "Yay! We turned the fear around and had fun doing it—no more surprises for us!"

Dora, back to normal, excitedly recounts the adventure to her Mom and Dad, gestures wild as she describes the transformations and scares. "Mom, Dad, we got scared first but with Geo, we became ghosts, cats, tigers, and skeletons—we scared everyone and even chased away the surprise thing! It was epic!" "That sounds thrilling, Dora—I'm proud you turned it into fun!" Dora grins, already sketching plans for next year's bigger scares. "Next Halloween, we'll plan even more transformations and parties—watch out, world!"