Darkness falls over Cybertron as the legendary Onyx Prime returns, throwing the planet into chaos! What does this mean for Optimus Prime--and Earth?
As Onyx and his comrades sow panic and dissension on Cybertron, Windblade defends an already tense planet against a secret that could shatter it forever, while Soundwave questions a fragile alliance, and Optimus confronts a mystery that goes back millions of years.
Collects Transformers: Optimus Prime issues #15-21.
Darkness falls over Cybertron as the legendary Onyx Prime returns, throwing the planet into chaos! What does this mean for Optimus Prime--and Earth?
As Onyx and his comrades sow panic and dissension on Cybertro...
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