The Doctor investigates ESP; Mike Yates asks Sarah to examine the mysterious goings on at a meditation centre he's attending.
An archaeologist allies with a Cyberman unearthed by an expedition on the planet Telos. With Patrick Troughton.
The evil Count Grendel holds Romana, the Princess and the Prince hostage as part of his plan to usurp the throne of Tara.
Only a last-minute rescue can save Romana, the fourth segment and the kingdom from Grendel's infamy.
