Arc 6: Harbinger of Doom and Betrayal Optimus’ Spark is going to break as he discovers the truth behind his brother, Megatronus. How will he cope with the War between Autobots and Decepticons starting again? TMC 6-1 TMC 6-2 TMC 6-3 TMC 6-4 TMC 6-5 TMC 6-6 TMC 6-7 TMC 6-8 TMC 6-9 TMC 6-10