> Hailing from the eighth planet in the Kreplok System, Gantu rose to captain the Galactic Federation's Galactic Armada, serving as second-in-command to the Grand Councilwoman. His career ended abruptly when he was dishonorably discharged after singing poorly at a holiday party karaoke event. Following his dismissal, he realigned with Dr. Hämsterviel, displaying increased subservience compared to his previous portrayals and enduring frequent verbal abuse without overt defiance.
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> He continued partnering with Experiment 625, Reuben, on missions to capture experiments, relying heavily on his plasma pistol for combat and capture, occasionally deploying inventions like a specialized "trog call" to lure targets. Throughout the series, his competence and intimidation diminished, leading to frequent mission failures caused by interference or his own miscalculations, resulting in comical or humiliating outcomes.
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> Specific episodes depicted his activities: enduring pain from Hämsterviel's dander allergy in "Swapper," surfing in "Phoon," singing karaoke in "Snafu," and dancing at a luau in "Clip." His character remained primarily a comedic antagonist subordinate to Hämsterviel and later the new antagonist Delia in the third season, without achieving significant redemption or evolution.