Mark of the Astro-Zombies

Aliens are operating on people, planting computer chips inside human brains and replacing organs with synthetic substitutes. The initial plan: Send dozens of mindless Astro-Zombies -armed with machetes- to Earth with orders to indiscriminately kill! A pair of ruthlessly ambitious criminals formulate a scheme to capitalize on these horrific events... (imdb) (Summary by Ag0stoMesmer)