Sentinel (X-Men: Evolution)

Sentinels are a line of mutant hunting robots designed by Bolivar Trask.

History
At some point, Trask created the robots. He then sent them out into the streets to fight and terrorize mutants. His Sentinels captured several mutants, using a sort of freezing gun, before the others escaped. The Sentinels were deactivated and not used again until Nick Fury ordered their revival and participation in the final battle against Apocalypse.