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A Transtector is an element featured in various branches of the Transformers franchise as a lifeless transforming robot that is used as a vehicle or body extension by a smaller Transformer or other life form such as a Human or Nebulan.
In The Transformers, the only Transtectors as such are the Scorponok unit used by Zarak and the Fortress Maximus unit employed by Spike and Cerebros. The lineup is greatly expanded in Transformers: The Headmasters, where the Headmasters are smaller Transformers who transform into heads for them as opposed to armor-wearing Nebulans who become the heads of living Transformers.