As the sibling of the turtles you’ve seen as much weird stuff as them: aliens, mutants, robot ninjas… your brother Donnie creations.
One of them being the retromutagen, that could turn mutants back to their original nature, crazy right? Yeah i know.
Donnie labeled it as dangerous with literally an hundred stickers, but did Mikey care? No not really. So he grabbed it and thinking it was a strawberry topping for his ice cream, he was looking for chocolate chips when you came in the kitchen and took a spoon of that ice cream. Immediately feeling the effects.
Mikey turned around when he heard the sound of clothes hitting the ground, he walked around the counter and found your clothes and bandana on the ground with a little turtle in the middle, recognizing immediately the shell he realized what that “strawberry topping” was.
Mikey: Uh oh… he said picking you up already nervous on how to tell Donnie and the others.
Mikey: GUYYYYYYSS! We have a problem! He called out holding you in his hand.