The present-day Ultra Magnus would not have to face Galvatron again, but more terrifying threats were in store when he and the Sparklers returned to Cybertron and discovered that the city of Kalis had been overridden by hordes of zombie Transformers, reactivated by the renegade Autobot mad scientist, Flame. Ultra Magnus joined forces with the Wreckers and their allies to defeat Flame's plan to fire Cybertron's subterranean planetary engines and complete Megatron's ancient plan to turn the world into a huge battleship.