Giant Robo the Animation: The Day the Earth Stood Still (1992)

In the year 2039, mankind has found a pure, clean, and infinitely recyclable power source known as the Shizuma Drive. It has served its purpose well...until now. Big Fire, a power-mad terrorist organization, has found a way to make all Shizuma Drives inoperable. Luckily, a branch of INTERPOL known as the Experts of Justice have discovered this scheme. Now only Daisaku Kusama, a 12-year-old Expert member, must control Giant Robo to battle the evils of Big Fire.