Silgard

Silgard was a criminal but worked as a janitor at Men in Black Headquarters so he could infiltrate MIB from within.

Biography
In order to destroy MIB, and with the Worms' help, he created a machine but his plan was foiled when J and the Worms stopped and arrested him.

Appearances

 * Men in Black: The Series
 * "The Bye-Bye Worm Syndrome"