Roller
From Multiversal Omnipedia
Roller was the secondary unit of the original Optimus Prime, contained in his trailer when he was in vehicle mode. It resembled a small six-wheeled moon-buggy-like vehicle. Roller was generally used for reconnaissance.
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Comments
Roller only appeared twice in the US animated series. It was never used in the Marvel comic, though it was mentioned as existing in his Transformers Universe comic-book entries.
One wonders what happened to Roller following the death of its primary unit- presumably, it died along with Prime.
