Primacron

Primacron is the name of the absolutely ancient scientist responsible for building Unicron in the Generation 1 cartoon continuity at the dawn of time. Besides the GREAT contribution of a giant planet devouring robotic monster, Primacron also created the energy siphoning Tornadron. He may have also had a hand in creating the Matrix.

So maybe he wasn't all bad. Even if his only worthwhile possible contribution was the means to temporarily stop his most murderous creation.

...way to go there Primacron.