First revealed in mid-2017 at San Diego Comic-Con, Power of the Primes, in keeping with the previous two toylines, features a line-wide gimmick: "Prime Masters", small Titan Master-type figures that represent the sparks of the Primes. Unlike Titan Masters, Prime Masters are available only in their own pricepoint, where they are packaged with Pretender-style Decoy Armor, but can interact in some way with all larger assortments.
Legends Class figures retain the ability to seat a small figure in alt-mode, whilst the Deluxe and Voyager Class pricepoints see the return of Combiner Wars-style Combiners. The combination joints remain unchanged, whilst the hand/foot system is tweaked: all Deluxes now include a hand, and all Voyagers a pair of feet. These accessories also facilitate the Prime Master integration for those size classes: Deluxes can use their hand as chest armor, into which a Prime Master spark mode can slot, and Voyagers can use their feet as forearm bucklers, which similarly fit a Prime Master. All Voyager Class figures also include an Enigma of Combination, shaped like a Prime Master spark mode, that can fit onto their combined mode chest.
Finally, Leader Class figures feature an "Evolution" gimmick, wherein each toy includes a Deluxe-sized character who can "evolve" into a Prime by combining with additional armor. Each Leader includes a uniquely-colored Matrix of Leadership, the central crystal of which can be removed and replaced with a Prime Master.
Ahead of the line's release, a fan vote took place to determine a character who would become a new Prime in both the toyline and accompanying stories, with Optimus Primal claiming victory, and a place in the Leader Class assortment.[1]
