Ableton Live: Vocoder + Operator = Aggressive Robot Voice Effect (with pitch control) 

Create the best aggressive robotic vocal effect in minutes and learn how to pitch the vocal into the key of PURE AWESOME with notes, melodies, chords, or progressions. You haven't seen this yet, so give it a go and stick it out right until the last second; nearly 1000 FAVES in a month can't be wrong!
The effect can be used on any audio source, so don't let your mind trick you into thinking this is a vocal-only effect. It will make the Autobots and Decepticons quake in their rear-quarter-panels, so add it to your repertoire. Once you learn how, it will take about a minute to recreate this effect...from memory.