When he has a dream about a future Earth devastated by pollution, Walter begins to understand the importance of taking care of the environment.

On his birthday, Calvin and his friend Rodney see a magician perform, then copy him by hypnotizing Calvin's little sister, but the joke is on them when they are unable to snap her out of it.

With the gang spread across the country (and beyond) at college, Spencer is back to feeling out of place, even when he returns home over winter break. Desperate to escape his grandfather who is sharing his room, and to feel confident again, he attempts to fix the broken Jumanji video game, giving his friends no choice but to level up and return to rescue him.