On the eve of Earth Day, a precocious seven-year-old learns about the wonders of the planet from his parents—and a mysterious exhibit at the aptly named Museum of Everything.
| Actor | Role |
|---|---|
 Meryl StreepNarrator (voice) | Narrator (voice) |
 Jacob TremblayFinn (voice) | Finn (voice) |
 Chris O'DowdFinn's Dad (voice) | Finn's Dad (voice) |
 Ruth NeggaFinn's Mum (voice) | Finn's Mum (voice) |
 Rob RackstrawCrowd Voice (voice) | Crowd Voice (voice) |