Tumbleweeds

In 1960 an alien object crashes from space to a remote rural farm in a sparsely populated town of Yarrawonga, Australia. Strange and macabre unexplained incidents begin occurring amongst the town’s population— murders, humans undergoing alien mutations, and zombie attacks are frequent, then the incidents abruptly stop!
Decades later the macabre murders and alien mutations resurface. The Pappas siblings Olivia, a forensic coroner; Daniel, a physics professor; and Addison, a law enforcement officer begin to investigate. They suspect an alien conspiracy involving innocuous looking Tumbleweeds.
Is the alien object the catalyst for all this evil? Or is this part of an invasion involving a sophisticated alien race? Who will believe Olivia, Daniel and Addison? Who will stop this evil? Government super powers are alerted around the world, to do battle against the annihilation of the human race…