England, the near future. Mike Yates, formerly of UNIT, is disturbed by odd happenings at a monastic retreat. Using Sarah as a liaison, he is able to warn the Doctor and the Brigadier. But how is the Doctor's research into ESP and the blue Metebelius III crystal connected to Mike's warning?
| Name | Type | Role | |
|---|---|---|---|
| Barry Letts, Robert Sloman | Writer | ||
| Barry Letts | Director |