1. Ultra short haircut, no sideburns - The Murder Market
2. Short haircut, no sideburns, light wavy - The Master Minds
3. Short haircut, no sideburns, curly - The Hour that Never Was
4. Short haircut, no sideburns, thicker more curly hair, less hair gel - Castle De'Ath
These are the basic haircuts. In many episodes Steed used hair gel - often way too much of it I would say.
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