"Hoo boy. How do I answer this one?" Mikey glanced around at his brothers.
"Don’t look at me," Raph said, shoving Donnie forward. "Donnie, you’re the smart one. Say something nerdy."
"Well," Donnie mused, tapping a finger against his chin. "The quantum variables inherent in the displaced multiverse—"
Leo clapped a hand over Donnie’s mouth. “Maybe we should leave this one to Mikey.”
"Pssh. Amateurs." Mikey looked down at the little turtle in his arms, nuzzling against her reassuringly. "See, there are lots of different worlds out there. You know, like Wonderland, and Narnia, and the moon and stuff."
"Uh—" Donnie began, holding up a finger. Worldlessly, Raph grabbed Donnie’s hand and forced it back down.
Mikey smiled at him and continued. “And we all know that our family is awesome, but having more than one of us is just too much awesomeness for one world to handle, so there’s one of our family on a bunch of different worlds. So there’s a whole mess of mes, and a bunch of Leos, and on your world, you’re all girls. Last time, you met one of the other Leos who was all tiny. And I look like you cause we’re totally twins! And usually you’re bigger, but for now you’re in tiny travel size, which is cool too.” He reached out and gently prodded the stuffed alligator. “And you brought a friend with you. Who’s this?”