The Doctor's trial continues. The Valeyard's next piece of evidence for the prosecution concerns the Doctor's recent trip to Thoros Beta. Though originally investigating arms dealing, the Doctor and Peri become embroiled in their old enemy Sil's alarming neurological experiments...
| Name | Type | Role | |
|---|---|---|---|
| Phillip Martin | Writer | ||
| Christopher Ryan | Guest Star | ||
| Brian Blessed | Guest Star | ||
| Thomas Branch | Guest Star | ||
| Trevor Laird | Guest Star | ||
| Alibe Parsons | Guest Star | ||
| Patrick Ryecart | Guest Star | ||
| Ron Jones | Director |