Monster Rancher

While running from a squad of creatures called JaggerNauts, Genki and the others stumble across a factory. The JaggerNauts follow them into the factory, and they battle. However, an android, Melcarba, is still lying dormant in the factory for millions of years and kills all of the JaggerNauts. Then it turns on the Searchers, and they have to use the lightning storm to shut down the derranged cyborg.