Doc Brown and Marty McFly glanced at each other inside Doc Brown's time traveling DeLorean as they had two cute kids accompany them. However, these two 'kids' weren't something you'd expect... they were a pair of ice climbers.
"So, what's your names?" Marty asked as he brushed back his brown hair.
"I'm Popo!" The blue clothed boy Eskimo exclaimed.
"I'm Nana!" The pink clothed girl Eskimo shouted.
Doc Brown and Marty blinked as they watched Popo and Nana high five each other.
"And together, we make the Ice Climbers!" Popo and Nana topped off as they winked.
"...Well... it's a pleasure... to make your acquaintances," Doc Brown cleared his throat as he was driving the DeLorean in the sky, with it raining as there were flying cars about. "So, how did you get into my time machine?"
"Oh, we just found it lying around near a glacier when we were just climbing a snowy mountain," Nana explained as she rubbed her wooden mallet.
"So we figured to just wait inside and see what happens." Popo added.
Doc Brown and Marty couldn't make any sense of this case, so they just shrugged and went with it as they entered the 2015 Hill Valley.