This is the sequel to 'Z-9: A SIR of Doom'. Only this time it's Zero not Z-9.
Zero is an Ex-Elite Soldier. He was arrested because Zero was taking his Invader's test when Zim intruded. Zim's idiotic self broke the Control Brain and it created a wave of doom that shut the power off Irk for 50 years. The Tallets desperatley wanted the person caught. Zim framed Zero and Zero was banished to Vort Prison for 3,000 Years. He teamed up with Prisoner 777 and created his Sir unit, Z-9. He used Z-9 to escape and build a new ship that was only second to most advanced ship.