An unnamed world, an unknown time. A vast mining vessel trawls a sea of mineral sand for valuable ores, the tiny human crew served by an army of humanoid robots. But as the Doctor and Leela arrive, one of the crew is found murdered... and if they didn't do it, who did?
| Name | Type | Role | |
|---|---|---|---|
| Chris Boucher | Writer | ||
| Mark Blackwell Baker | Guest Star | ||
| Tariq Yunus | Guest Star | ||
| Mark Cooper | Guest Star | ||
| Jeremy Ranchev | Guest Star | ||
| Miles Fothergill | Guest Star | ||
| Rob Edwards | Guest Star | ||
| Richard Seager | Guest Star | ||
| Russell Hunter | Guest Star | ||
| Peter Langtry | Guest Star | ||
| Brian Croucher | Guest Star | ||
| David Bailie | Guest Star | ||
| Gregory de Polnay | Guest Star | ||
| Tania Rogers | Guest Star | ||
| John Bleasdale | Guest Star | ||
| Michael E. Briant | Director |