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It has long been understood that Optimus Prime is not the only character in Transformers history to have the name "Prime," but in most continuities, he is the only character to
currently possess that name. There are a number of reasons for this, both real-world and in the world of Transformers fiction. In the fiction, the name "Prime" is usually
* used to designate that a character is someone special, either the leader of the Autobots or one of the original Transformers from the dawn of creation (if not somehow
both). In the real world, the folks has Hasbro have similarly determined that "Prime" is a name of importance, and that its usage should be monitored carefully (leading to occasional fiascoes like that which accompanied the name of
the first club combiner). Given this reality, it's perhaps something of a surprise that the club was allowed to use the name "Nova Prime" on one of their toys.