Action Master Elite Double Punch (1991)

As is well-understood by nearly all Transformers fans who've ever heard of them, Action Masters were Transformers that didn't transform.

Except for the ones that did.

While 1990, the year the Action Masters were released, was the last year of the original Transformers toyline in the United States (they would return by 1993 as Generation Two), the Transformers line never stopped in other parts of the world. Notably, in Europe and parts of Australasia, Action Masters were released for a second straight year, including both repaints of molds released the previous year and totally new molds. Four of these new molds formed an Action Master sub-line: "Elites."

Transformers Collectors' Club Double Pretender Optimus Prime (2017)

Transformers Collectors Club exclusives can be described as coming in one of three different flavors: 1) a new character, never before seen, 2) a new form for a well-known character, or 3) a reference to an obscure character or concept. I suppose one could say the same about all Transformers figures, but it remains a convenient way to discuss exclusives. Oddly enough, the Transformers Figure Subscription Service (TFSS) 5.0 Optimus Prime set actually straddles flavors 2 and 3.