Metarex

The Metarex are a army of robots from the TV series Sonic X. They are led by the super powerful villian known as Dark Oak.

The Meterexs' origins are mysterious, as are their motives. They have traversed the galaxy, stealing Planet Eggs and objects of power, leaving whole worlds dead or dying in their wake. Among their victims are Cosmo's homeworld, along with every member of her species except her. They also implanted Cosmo with a hidden sensor, turning her into an unwilling spy.

The Metarex are incredibly powerful, too strong for Sonic the Hedgehog and his allies to defeat without power-ups. There are multiple types, and they appear in every environment.