In Transformers: Timelines volume 2 #2, "Games of Deception", traveling to Earth with a group of Bludgeon's Decepticons (unaware they were being trailed by Ultra Magnus' forces), they met up with Megatron's second-in-command Starscream.
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In Transformers: Robots in Disguise, a subtle nod is given to Alpha Trion's status when Optimus Prime mentions that both he and his brother Ultra Magnus were created by Alpha Trion.
The story of the Duocons in Marvel Comics begins in the United Kingdom's exclusive Transformers comic book series, where they both appeared to battle the Autobots Ultra Magnus and the Sparkabots, who had only just returned to Cybertron.
Rodimus tells Ultra Magnus to take the Aerialbots and Throttlebots and retrieve Optimus' body, while Rodimus and Jessica distract Swofford and Morgan.