On a late summer evening in 1977, Ohio radio astronomers discovered a strong, interstellar signal that is believed by many to be the best evidence of communication from an extraterrestrial civilization.
| Actor | Role |
|---|---|
| JJerry EhmanSelf | Self |
 Seth ShostakSelf | Self |
 Karen O'NeilSelf | Self |
| MMichael HolstineSelf | Self |
| BBob DawsonNarrator | Narrator |
| EEllie WhiteSelf | Self |