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SIEGE begins in the final hours of the devastating civil war between the Autobots and Decepticons. The war that has torn apart their home planet of Cybertron is at a tipping point. Two leaders, Optimus Prime and Megatron, both want to save their world and unify their people, but only on their own terms. In an attempt to end the conflict, Megatron is forced to consider using the Allspark, the source of all life and power on Cybertron, to "reformat" the Autobots, thus "unifying" Cybertron. Outnumbered, outgunned, and under SIEGE, the battle-weary Autobots orchestrate 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.
Optimus struggles to obtain the Allspark. Megatron figures out Optimus' plan and orders an attack on the Autobots, who receive an unexpected assist.
Jetfire offers to help Optimus retrieve the Allspark. Bumblebee, Cog and Arcee go on a mission for energon; Wheeljack tries to get the Ark to fly.
Elita casts doubt on Optimus' plan, which includes fixing a Spacebridge. Optimus appeals to the Guardians for help and Bumblebee receives a high honor.
Optimus has a plan but needs Ratchet's help. Ultra Magnus is tortured for information while Starscream continues to foster dissent among the Seekers.
Megatron receives a surprise visitor; Shockwave reveals how finding the mythical Allspark can help defeat the Autobots. The Decepticons lay a trap.
Megatron urges Optimus Prime to accept a treaty, while Starscream questions Jetfire's leadership. The Autobots try to recruit Bumblebee to their side.
The frantic race to locate the Allspark first culminates on a strange planet as the future comes crashing through to the present day.
With the Allspark gone, Megatron is forced to confront the harsh reality that his Decepticons are trapped on a dying Cybertron. Meanwhile, lost in the darkest reaches of space, Optimus Prime and his team embark on a desperate mission, unexpectedly running into ... the spacefaring Mercenaries.
SIEGE begins in the final hours of the devastating civil war between the Autobots and Decepticons. The war that has torn apart their home planet of Cybertron is at a tipping point. Two leaders, Optimus Prime and Megatron, both want to save their world and unify their people, but only on their own terms. In an attempt to end the conflict, Megatron is forced to consider using the Allspark, the source of all life and power on Cybertron, to "reformat" the Autobots, thus "unifying" Cybertron. Outnumbered, outgunned, and under SIEGE, the battle-weary Autobots orchestrate 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.