The year: 2020. The Terrahawks Organization is mounted and they are ready to defend Earth against hostilities. When an energy source is picked up heading for Earth. Lt Hiro and his robot Zeroids blast off - but fail to destroy it.
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The Hawkwing and Battlehawk are launched to investigate, but Ninestein is captured by Zelda, who uses him as a hostage in a bid to escape - but Hiro frees Tiger.
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While the Zeroids are exploring a crater on a meteorite they believe may contain gold, Zelda sits back and smiles. The 'golden nugget' they find is secretly a bomb - planted there for just such an occasion.
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Zelda releases one of her allies, Lord Sram, from suspended animation and sends him to Earth. Sram is shot down by Kate Kestrel. But the alien survives the crash - and makes life very uncomfortable for Tiger Ninestein.
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Journalists Mark Darrol threatened to expose the Terrahawks. Zelda contacts him and puts him aboard a ship taking food to the Terrahawks' base. But Tiger Ninestein has his own methods of writing off this latest threat.
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Alpha Probe, first launched in 1999, returns to Earth and the Terrahawks are assigned to bring it to base, where the Zeroids begin to work on it, unaware that Zelda has secreted one of her cube robots on board - with a gravity bomb.
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Tamara, a space samurai and commander of a powerful battle cruiser, insists that Zelda and Ninestein patch up their vendetta. prepared for the worst. Tiger agree - knowing that Zelda cannot be trusted.
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A visit to the district moon Callisto is an unpleasant experience for Tiger and his crew. They find themselves faced by a fearsome Sporilla - one of Zelda's most terrifying monsters.
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Master of disguise, Mold, a faceless alien, is sent to Earth by Zelda. He crash-lands in the Arctic and the form of Lt Hiro, to sabotage Earth's defences and allows Zelda to invade the planet.
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Sergeant Major Zero and the Battlehawk destroy five of Zelda's cube robots in the Wild West county of Bad Water. But one cube survives and Zelda uses it to take over hill-billy Sam Oaky - and plan a shoot-out with Tiger at high noon.
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