Sarah Jane investigates alien lights and encounters an enemy from the past. Maria faces a big decision.
| Name | Type | Role | |
|---|---|---|---|
| Phil Ford | Writer | ||
| Juliet Cowan | Guest Star | Chrissie Jackson | |
| Ronan Vibert | Guest Star | Professor Nicholas Skinner | |
| Clare Thomas | Guest Star | Lucy Skinner | |
| Anthony O'Donnell | Guest Star | Kaagh | |
| Joseph Millson | Guest Star | Alan Jackson | |
| Joss Agnew | Director |