A ""time bomb"" planted in Blake's memory by the Federation has been stimulated. He goes to an asteroid to meet with the legendary Shivar and Governor Le Grand, who also wish to overthrow the Federation.
| Name | Type | Role | |
|---|---|---|---|
| Roger Parkers | Writer | ||
| Frieda Knorr | Guest Star | ||
| Martin Read | Guest Star | ||
| Richard Bebb | Guest Star | ||
| George Spenton-Foster | Director |