This short begins at Boulder Dam (now Hoover Dam). The electricity generated here by the Colorado River is sent to Hollywood, where movie studios need it to make movies. After a tour of the MGM studios' power plants, we see short advertisements for upcoming MGM releases.
| Actor | Role |
|---|---|
| FFrank WhitbeckNarrator (voice) (uncredited) | Narrator (voice) (uncredited) |
 Jo Ann SayersSelf | Self |
 Ray BolgerSelf (uncredited) | Self (uncredited) |
 Judy GarlandSelf (uncredited) | Self (uncredited) |