Ben was an alien and he liked killing people. He had a boss that wanted to take over the world. When they were nearing the green and blue planet they launched a shrink bomb. It exploded all over Earth.
When Ben landed on Earth he started shooting people and they turned into beads. The alien armada succeeded in taking over Earth.
But they got greedy and also took an alien armada to planet T-rex. They attacked the aliens from T-rex. These aliens were highly armed they killed Ben and his army.