Across the Milky Way, galaxies are going dark, and scientists don't know why the stars are losing their shine; astronomers race against time to uncover the truth behind how galaxies are born and how they die before all of the lights go out.
| Name | Type | Role | |
|---|---|---|---|
| Michelle Thaller | Guest Star | ||
| Hakeem Oluseyi | Guest Star | ||
| Phil Plait | Guest Star | ||
| Grant Tremblay | Guest Star |