The stealthy ninja-bot Undertone has a "strong, silent type" personality that some folks may have a hard time getting beyond. That he'd prefer to let his actions speak for him makes him an ideal partner for the often-taciturn Ratchet.
After the rebirth of Cybertron, Ratchet was given the task of patrolling space and capturing any rogue Decepticons by the Council, who weren't enamored with the Autobots. To aid him in his task, he was partnered with Undertone. The duo tracked a Decepticon to Earth, where they ran across Clampdown and Bumblebee's Bee Team. Undertone followed Ratchet back to Bumblebee's scrapyard base, where they encountered Toolbox. Undertone came along with Ratchet to take part in the raid on Glowstrike's Decepticon base. The team slipped into the base by masquerading as Grimlock's captives, although they were eventually spotted and surrounded by Steeljaw's new army of Decepticon fugitives.
The Autobots managed to escape from this predicament thanks to Windblade providing them with an impromptu distraction. The team then had to split up, buying time for Bumblebee and Optimus Prime to detonate a cryo-gas bomb in the ship's ventilation. In order to rescue Windblade, Undertone and Ratchet fought alongside Drift and his Mini-Con students against Overload, but the Decepticon got beyond him, and he wound up getting thrown in a stasis pod. Jetstorm and Slipstream released them, and the Autobots escaped the ship after Bumblebee and Optimus detonated their bomb.
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