Transformers: Retribution

Continuing their search for the AllSpark, the Autobots and Decepticons encounter the Quintessons.[1][2] The Decepticons also have a brief battle with the Star Seekers, with the pirates using the Requiem Blaster against the Decepticon flagship Nemesis before being forced to jettison it. They then follow the Autobots to the planet Aquatron, a water planet that doesn't appear in any of their records, where they find an apparently peaceful race who trade in Energon and welcome the arrival of the Autobots. This is all a front, however, as the planet is secretly dominated by the Quintessons, who aim to destroy all the Cybertronians in revenge for the defeat they previously suffered at their hands.

Back on Cybertron, Alpha Trion is captured by Shockwave, who attempts to use him to access the supercomputer Vector Sigma so that he may create a Decepticon Matrix of Leadership. Unbeknownst to the Decepticon scientist, the Quintessons have created their own Matrix replica which they have been using to manipulate Optimus Prime and cause him to doubt himself as leader of the Autobots. Furthermore, the Quintessons are aware of Shockwave's efforts and are using him to help lay the groundwork for their invasion of Cybertron by reactivating a long dormant Space Bridge. Claiming to be a peaceful, benevolent race, they disable both the Nemesis and the Autobot Ark and bring both parties together for negotiation, but in reality seek only to capture and enslave them.

Megatron and Optimus find themselves working together against the Quintessons, with the other Autobots and Decepticons following suit. The Quintessons succeed in sending their Sharkticon army to Cybertron, but are unaware that Megatron is a figure of Sharkticon legend who is destined to free them from the Quintessons. He does so by taking possession of the Quintessons' replica Matrix (assuming the "Sharkticon Megatron" form depicted in the Transformers: Prime toyline). The invasion of Cybertron is thwarted, and the Quintesson hold over Aquatron-revealed to be a lost colony world of Cybertron-is broken, though Megatron loses the replica Matrix and his Sharkticon form. Alpha Trion is saved from Shockwave by the Wreckers, and concludes the book by noting the existence of a certain planet that is destined to play a major role in the struggle between Autobot and Decepticon.