Rainbow accepts the monster's apology and sends it on its way.before the Powerpuff Girls, believing it to be attempting to escape, fly up and beat it to a pulp.
Rainbow Dash flies in to attack again, but the monster, revealing itself to be able to speak, surrenders and-at Rainbow's demand-apologizes for attacking the city. Before the monster can finish the girls off, Rainbow Dash steps in, attacking the monster and sending it flying into a building with a sonic rainboom. The girls proceed to beat the monster up a little before it angrily retaliates, slamming the girls into the ground. The monster lays waste to the city until a trio of flying girls appears to confront it: Blossom, Bubbles, and Buttercup-the Powerpuff Girls. is under attack!" - The narratorīlossom, Bubbles and Buttercup hugging Rainbow Dash Rainbow Dash meets the Powerpuff Girls " The City of Townsville. Before she can even figure out where she is, she hears the loud roar of a giant rampaging monster. She emerges in an urban city on an empty street. Rainbow Dash awakens inside the wormhole, and as she passes through it, she floats past a number of strange-looking characters before the wormhole spits her out the other end. All she finds in the double rainboom's wake is a twin trail of multicolored fire leading up to a wormhole that disappears moments after Twilight discovers it. Ponyville is left in shambles, and Twilight goes to find Rainbow Dash. The shockwave it creates blows fiercely over Ponyville, destroying buildings and sending everypony flying, and can be seen stretching over a good portion of the planet's atmosphere. In a tremendous boom of sound, Rainbow Dash pulls off the double rainboom. Her body has almost completely changed color, and the faces of her pony friends turn from excitement to concern. Twilight calls out to her from the ground below, telling her to slow down, but Rainbow doesn't hear her. As Rainbow Dash prepares to pull off the double rainboom, her body begins to change from her hind hooves up, she starts turning into an actual rainbow. The rainbow-colored trail she leaves behind her grabs the attention of numerous ponies below (especially one very amazed Scootaloo who cheered for Rainbow Dash). She outstretches her wings and takes off like a rocket. She tests out her newfound speed and races through Ponyville, zooming past several of her fellow ponies (including Applejack, Rarity and Fluttershy, before arcing up through the clouds and lower atmosphere before stopping in outer space and amazed by her own speed, Rainbow Dash comments that she could easily do a sonic rainboom - maybe even a double rainboom. Rainbow Dash opens her eyes to find herself high in the sky above Ponyville, surprised that she'd flown so high up. The blue Pegasus takes off almost immediately and crashes through the ceiling, leaving behind her a trail of rainbow smoke and a dumbfounded Twilight. When nothing happens and Rainbow Dash seems just fine, Twilight releases her and gives her permission to fly. Twilight, concerned about what effects the potion might have, hooks Rainbow Dash up to several measuring instruments to monitor her for side-effects. As Twilight imagines what such a potion would do to a pony as unpredictable as Pinkie Pie, Rainbow drinks it while Twilight's back is turned. Rainbow Dash's curiosity is further piqued at the thought of being able to fly faster.
An excited Rainbow prods Twilight with questions as to what the potion does Twilight explains that it's a "talent enhancer", designed to amplify a pony's natural talent (such as augmenting Twilight's magical power or heightening Applejack's physical strength and applebucking abilities). A face within the smoke laughs wickedly at Twilight and Rainbow Dash before it gets sucked into a test tube and sealed with a cork. When she adds the final ingredient, a chemical explosion fills the library with purple smoke. Twilight explains she's making a potion that she'd been working on since magic kindergarten. During her delicate work, Rainbow Dash interrupts, curious about what her unicorn friend is up to (nearly causing Twilight's compound to spill in the process). In her library home in Ponyville, Twilight is mixing some chemical compounds in a beaker.