Armagedroid

Armagedroid (nicknamed XJ-0 by some fans) is a 100 foot-tall android created by Dr. Nora Wakeman (also the creator of XJ-9/Jenny.)

First Intergalactic War
His original purpose was to destroy all alien weaponry during "The First Intergalactic War", but eventually became mad with power and destroyed ANY weapon that crossed his path. He is one of Jenny's few enemies that not only she couldn't defeat alone, but almost killed her (twice) in the process. After Armagedroid, Nora stated that she started the XJ series to replace him.

Return
Armagedroid returns from his lava trap and attacks Tremorton.

Second Return
Armagedroid returns to defeat Jenny and Killgore. The robot later commits suicide and is destroyed for good.

Trivia

 * Voiced by Kevin Michael Richardson who voices Lobo and Tartarus.