Outnumbered, outgunned, and pushed to the brink of extinction, the battle-weary band of resistance fighters orchestrates a desperate series of counterstrikes on a mission that, if everything somehow goes right, will end with an unthinkable choice: kill their planet in order to save it. The Autobots, led by Optimus Prime, make a perilous last stand to hold off the Decepticon conquest of Cybertron. In keeping with this, the Siege and Earthrise Battle Master and Micromaster size classes form modular weapons, as did the introduction of Weaponizers, Modulators, and Fossilizers figures which could be disassembled into a variety of 5 mm compatible weapons and accessories. System, with Deluxe Class-and-higher figures being littered in 5 mm ports to facilitate being armed up with any combination of compatible weaponry.

All figures are now compatible with the C.O.M.B.A.T. In keeping with installments of the Prime Wars Trilogy, the War for Cybertron Trilogy lines feature a unified, line-wide gimmick: weaponry. A third installment, Kingdom, concludes the trilogy and features the return of the Maximal and Predacon factions from the Beast Wars franchise, and sees the addition of a new(-ish) size class, Core. The toyline also focuses on modular base-forming with the A.I.R. The second installment, Earthrise, takes place during an interstitial period as the Autobots and Decepticons travel through space, seeing many gain Earthly vehicle modes, while also introducing space-faring characters such as the Quintessons and Mercenaries.

The first installment of the trilogy, Siege, is set during the final days of the Transformers' civil war on Cybertron, reimagining classic characters to give them Cybertronian alternate modes and battle damage deco.

The War for Cybertron Trilogy toylines aim to serve as a back-to-basics approach to Transformers, with a focus on media-accuracy, articulation, and a consistent robot mode scale (relatively based on the Generation 1 cartoon). Main article: War for Cybertron Trilogy (toyline)

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