Siege of Massunstrad
From MediaWiki
The Siege of Massunstrad was a battle between the Autobots and Decepticons involving Optimus Prime, Megatron, and an antimatter chamber. Any other details about the siege, such as which side was doing the besieging or where Massunstrad is located, are unknown.
Fiction
2005 IDW continuity
Optimus Prime sustained major damage at the Siege of Massunstrad when he was trapped inside the antimatter chamber by Megatron. Chaos Theory Part 1
Notes
Foreign names
- Japanese: Massunstrad no Hōisen (マッスンストラッドの包囲戦 Massunsutoranddo no Hōisen, "Siege Battle of Massunstrad")

