Transmorphers

Transmorphers is a science fiction alien invasion film released directtoDVD on June 26, 2007. It was written and directed by Leigh Scott and produced by David Michael Latt and The Asylum. Transmorphers was developed as a mockbuster, intending to capitalize on Michael Bays Transformers.

In 2009, a race of aliens piloting giant robots have conquered Earth and forced humanity to live underground. They have done this by altering the environment, causing constant rainfall and darkness. Over 300 years later, after many generations of living underground, a small group of human rebels plan to finally take back their world from the mechanical invaders. They soon learn however that the aliens do not pilot the robots, but are the robots.A patrol, led by Lt. Blackthorn Thomas Downey, is sent out to capture one of the robots, a Zbot, so its operating ability can be studied. The patrol is suddenly ambushed by several robots, with some being able to reconfigure themselves, revealing different weapon systems. These units, the transmorphers, ambush humans by appearing as mundane features of the terrain, even fooling detection systems. The robots use brain scans to read the minds of humans to know their battle plans. ........

Source: Wikipedia