Dora, the brave young explorer with her signature pink shirt and backpack, skips along the path with her best friend Boots, the cheerful monkey wearing red boots and a big smile. They laugh and point at butterflies fluttering around vibrant orchids, their adventure full of excitement as they search for the next treasure. "¡Vamos, Boots! Today we're going to find the biggest waterfall in the forest, and it'll be super fun with all the rainbows at the end!" "¡Sí, Dora! I can't wait to splash in the water and see all the shiny colors dancing in the mist – this is going to be the best day ever!"

Dora and Boots push through the vines, their eyes wide with curiosity as they spot something unusual ahead. Suddenly, a massive, shadowy figure looms behind a gnarled tree trunk, its eyes glowing red like embers in the twilight gloom, accompanied by a low, eerie growl that echoes through the clearing. "Dora, what's that? It looks like a giant monster with huge claws and fangs dripping with goo – it's coming right towards us!" "¡Ay, caramba! Run, Boots, run! It's the scariest thing I've ever seen, just like that spooky turtle friend on Halloween who fled from ghosts and goblins in the dark night!"

Dora grabs Boots' hand, both panting as they sprint wildly, hearts pounding like jungle drums. They dodge thorny bushes and leap over streams, their faces flushed with terror, mirroring the frantic escape of Franklin the turtle from Halloween horrors in his haunted neighborhood. "It's gaining on us, Dora! Those glowing eyes and that roar – I can feel its hot breath on my tail; we have to keep running faster or it'll catch us!" "Don't look back, Boots! Just like Franklin hid from the witches and pumpkins that came alive, we'll find a safe spot – keep going, we're almost out of the thick woods!"

Gasping for breath, Dora and Boots collapse near the stream, trembling as they pull out their communication device. Geo, the tiny blue Umizoomi engineer with a drill nose and construction hat, appears on the screen along with his friends, ready to help. "Geo, we need UmiZoomi right now! A scary beast with red eyes chased us through the jungle – it was huge and growly, and we're so frightened!" "Yeah, it was like a nightmare monster; please come quick and figure out what it was before it finds us again!" "Don't worry, Dora and Boots! We'll use our UmiZoomi powers to investigate – tell us every detail about the chase, the sounds, the colors, and we'll solve this mystery together step by step!"

Geo and his team arrive with Dora and Boots, using math magic to measure tracks and analyze echoes bouncing off the trees. They discover oversized footprints leading to a hidden bush, where fabric scraps and a familiar backpack peek out, turning fear into confusion. "Look at these measurements – the 'beast' tracks are exactly 4 feet long, but they match boots, not claws! And hear that pattern number: it's repeating like a friendly call, not a growl." "You're right, Geo! The glow was from fireflies, and the roar was wind through hollow logs – but who would play such a trick on us?"

It was Swiper, the sly fox with his mask and striped tail, and Benny, the big-hearted bull in a goofy monster outfit, all along – their Halloween-inspired joke gone too far. "Aw, shucks, Dora and Boots, we just wanted to give you a super spooky surprise like that turtle's Halloween adventure, with costumes and all, but we didn't mean to scare you that much!" "Yeah, sorry! We thought it'd be fun to run around like in the stories, but seeing you bolt like Franklin made us feel bad – promise no more tricks, just treats from now on!" "¡Está bien! Now we can all laugh about it and have a real adventure party together – UmiZoomi saved the day again!"