The Doctor arrives on what appears to be a sleeper ship. However, when he encounters a Vogan robot, the Doctor sets out to free the people aboard and those who are at its destination, for the Vogans are notorious slavers!
- The Doctor finds a interstellactic compass onboard the Vogan spacecraft.
- The Crallicans are natives of Crallica.
- Vogans require Voganite to survive.
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