The mice are miffed... "All creatures are endangered! Not just polar bears!" Nellie, Henrietta, Irene, Louise, and Emily embark on a quest across Canada to let people know climate change affects everyone...even mice! Rebuffed at Parliament, Nellie uses words of her famous namesake Nellie McClung to rally the mice. "We will pester them and pester them until they realize that we are creatures, too!" But no one takes them seriously until Nellie leads the mice to Churchill, Manitoba where Winston, a famous polar bear, finds the five mice just can't be ignored.