After hours of Autobot slicing and slaughtering, they finally arrive to the vault by blowing the entrance open via a Dark Energon airstrike. After the Decepticons launch a full scale assault on the Autobots' headquarter city, Iacon, the trio land and fight their way through to find Zeta Prime's, the Autobot's leader, secret vault, which contains the key to the core Cybertron.
In the beginning of the game, Soundwave starts off as Megatron's personal assistant on the battlefield, along with Breakdown. Soundwave remained at Megatron's side as the conflict escalated into a war. When a gladiator calling himself Megatronus vowed to challenge Cybertron's leadership, Soundwave was his first follower and chief amongst them.
He later sat on Cybertron's ruling council for a time, but grew disgusted at Cybertron's decay under the Caste system. As revealed in The Covenant of Primus, Soundwave was part of the resistance against the Quintessons in the Age of Wrath.