The Transformers: Monstrosity — IDW Publishing
Issue: #3
MEGATRON UNCHAINED! In the early days of the war, MEGATRON-exiled on JUNKION-battles to reclaim the throne of CYBERTRON. But the TERRORCONS have other ideas... Meanwhile, GRIMLOCK and the DINOBOTS threaten OPTIMUS PRIME's fledgling republic!
Creators: John Barber, Livio Ramondelli, Tom B. Long, Shawn Lee, Chris Metzen, Flint Dille
Characters: Megatron, Optimus Prime, Grimlock, Pentius