Megadeth

Assassin in stealth
Assailant from Hell
Impervious to damage
Computer on-board
Engaged in a war
Non-stop combatant
Maybe not a mutant, maybe a man
Chorus
Part bionic
And organic
Not a cyborg
Call him Psychotron
Burning inside
Godspeed in glide
Battle plan running
A killing machine
Just downright mean