Related Clues:

• One who does the lord's work
• Serf
• Confine
• Verdi's Aïda, e.g.
• 'Lost in Space' figure
• Slog
• Work like a dog
• Iron man?
• Feudal worker
• Automaton
• Futuristic slave
• Martian explorer, e.g.
• One doing the lord's work
• Uncomplaining servant
• Metalhead?