An Alien boy sent to destroy Earth with a giant robot instead uses the robot and five others to defend Earth from the Galactic Conqueror who sent him.
- Rokushin Gattai! God Mars!
http://tvtropes.org/pmwiki/pmwiki.php/Laconic/GodMars
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An Alien boy sent to destroy Earth with a giant robot instead uses the robot and five others to defend Earth from the Galactic Conqueror who sent him.