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The first major threat is an Osmosian named Aggregor, who kidnaps five unique aliens from the Andromeda Galaxy to steal their powers and become unstoppable. Ben and his team—Gwen and Kevin—must hunt down these aliens and stop Aggregor from reaching the "Forge of Creation" to obtain the power of a Celestialsapien. The Return of Old Enemies: ben 10 ultimate alien english subtitles