Geo, the clever builder with his trusty tool belt, plays with blocks, stacking them into a towering castle. Milli, the pattern-loving girl with her stretchy arms, swings nearby, her pink hair bouncing. Bot, the friendly robot with glowing screens, rolls around picking up stray balls, his wheels humming softly. "Look at my super tall castle, friends! It's the tallest in Umi City, with towers that reach the clouds and bridges for brave adventurers to cross!" "Wow, Geo, it's amazing! I love the patterns on the walls – red, blue, red, blue. Maybe I can add some stretchy vines to make it even more fun!"

Geo pauses his building, ears perking up at a faint rattling sound from behind the slide. A translucent white figure with glowing eyes emerges – a ghost! – floating eerily, its tattered sheets billowing in the wind. Geo freezes, his face paling, heart pounding like a drum in his chest. "Aaaah! A ghost! It's real, it's coming right for me! Help, it's got spooky eyes and chains rattling – I gotta run!" Geo drops his blocks and sprints across the grass, legs pumping furiously.

Milli[/@ch_2] and Bot gather around a picnic table littered with juice boxes and snacks.] Geo bursts into the circle, panting and wide-eyed, waving his arms wildly. Milli jumps up from her seat, concerned, while Bot's screens flash question marks. "Guys, you won't believe it! I saw a ghost by the slide – all white and floaty with scary glowing eyes! It was moaning and rattling chains, chasing me! We have to do something!" "Whoa, slow down, Geo. A ghost? That sounds super scary, but Team Umizoomi sticks together. Let's investigate and use our Umi skills to figure this out!" "Affirmative! My sensors detect unusual vibrations. Scanning now: fog levels high, temperature dropping. Friends forever!"

Milli stretches her arms to peek behind the slide, spotting the culprit. It's the mischievous Purple Monkey, giggling under a ghost costume made from old sheets, purple tail twitching. Bot confirms with his scanner, screens showing a monkey silhouette. "Aha! It's not a real ghost, Geo – it's the Purple Monkey playing a prank! He dressed up in that sheet to scare us, just like he tried last time with the banana traps. Sneaky monkey!" "The Purple Monkey? Oh man, I was so scared! But now I remember – he always pulls tricks like this. Thanks, friends, for helping me see the truth!" "Prank detected and debunked! Time for payback with super Umi teamwork!"

Geo grins, grabbing scissors to cut eye holes, while Milli patterns the sheets with spooky stripes. Bot attaches LED lights for glowing effects, his tools whirring. "Perfect plan! We'll dress just like he did – white sheets, glowing eyes, rattling chains. He'll remember how he scared me and get a big taste of his own medicine. Team Umizoomi ghost squad, assemble!" "Yes! I'll make our costumes extra stretchy for dramatic floating. This will be the best prank reversal ever – he'll run so fast, his tail will spin like a propeller!" "Costumes ready in 3-2-1! Ghost mode activated. Let's make him ooh and aaah in fear!"

The Purple Monkey looks up, eyes widening at the trio of moaning ghosts with glowing eyes and clanking chains, their forms ethereal in the mist. He drops his banana, fur standing on end. "Oooooh! We're the ghosts of Umi City, here to haunt sneaky monkeys who scare their friends! Boo! Rattle rattle – feel the chill!" "You scared Geo, now it's our turn! Floaty arms coming to get you – whoooo! Run if you dare!" "Ghost Bot reporting for duty! Sensors say you're terrified – maximum scare level achieved!" The Purple Monkey shrieks, bolting away into the night, tail trailing comically.

Geo high-fives his friends, the castle blocks still standing tall nearby. "Yay! We did it, team! The Purple Monkey got so scared, he ran for his life just like I did. Best friends and best prank ever – UmiZoomi power!" "Totally! Now he knows not to mess with us. Who's up for rebuilding that castle under the stars?" "All systems happy! Adventure complete – yay!"