It all starts out on a normal day in Ponyville, Rainbow Dash was enjoying a soda at a table near sugarcube corner with her best friend Fluttershy. Rainbow Dash talks with Fluttershy as they have a great time hanging out together as they are sitting there they soon hear some random ponies talk about an abandoned place in Everfree Forest and how it has some mysterious relics and ancient stuff.

Rainbow Dash decides to go to the Everfree Forest and Fluttershy reluctantly agrees to go with her to Everfree. Rainbow and Flutters are in the woods now and see that abandoned place those guys were talking about and then Dashie and Flutters go inside the mansion and then Rainbow Dash sees an abandoned laboratory in the kitchen and she goes over to the fridge and then she opens it and she finds what appears to be red fruit punch soda in a pitcher but it's actually a magical chemical and Fluttershy is reading a manual with notes about chemicals in the fridge and Fluttershy tries to warn Rainbow Dash but it's too late because Rainbow Drinks the magic soda because she's thirsty and Fluttershy didn't warn her in time before she drank it and after Dashie drank most of the magic soda she then turns into a foal/baby pony and automatically has a big thick poofy diaper on her rear end and the only thing she still has intact from her adult self is her adult mind and adult mentallity while the rest of her is now physically a foal. Rainbow Dash says hey what happenned Fluttershy? and how did you get so Big and tall? Fluttershy then gets a mirror and says you should look at yourself Rainbow Dash you're allot shorter and younger and smaller and you're a foal now. Rainbow Dash looks at her reflection and then looks at her diapered rear end and then yells AAAAHHHHHHHHHHHHHHHH!!!!!!!!!



Rainbow Dash then says I've been turned into a baby!!!!!!!!!!!!!! then Fluttershy reads the manual notes again and finds out it's an age regression magic soda potion that makes anypony who drinks it or has it poured onto them into foals/baby ponies.