The SubZero Heroes find out they survived the last major extinction before modern history. In doing so, they land on a tropical beach of a weird world that only a little girl and blue alien know about. Now they have to try adjusting to an era where modern technology and climate change dominate.
The Sub-Zero Heroes, Scrat included, have somehow survived the last major mass extinction and land in the tropical paradise we know as modern-day Hawaii. They will have to survive the Earth's conditions now while adjusting to a new environment.