Tornedron

Tornadron is a creation of Primacron from the Generation 1 continuity family.

Some people/space monkeys never learn.

Untold eons after his most powerful creation, Unicron, rebelled and nearly destroyed him, the immortal mad scientist, Primacron, decided to have another go at it. This time, he created a monster entirely of energy. The result was Tornadron, a being capable of taking any form it chooses and can suck all manner of energy from anything in the known galaxy.

Fiction

Generation 1 cartoon

Voice actor: Neil Ross (US), Yutaka Shimaka (Japan)

Tornadron was created by Primacron as his second means to take over the Universe. Sensing the danger Tornadron presented, Primacron's Assistant (now a disembodied energy being, himself), telepathically summoned all the "Primitives" among the Transformers. The Primitives were charged with defeating Tornadron, who had already sucked all the energy from Cybertron and Earth.

The Primitives performed rather poorly, all being drained of energy save for Grimlock, who managed to elude Tornadron. As one could expect, Tornadron quickly rebelled against Primacron just as Unicron had, and threated to "eat" his creator. Before Tornadron had the chance (well, okay, he had a lot of chance, he was just taking his dear sweet time to do so, like a big dumb doof), Grimlock came to the rescue and randomly flipped a reversal switch which caused all of Tornadron's energies to disperse. All the energy he had devoured was returned to its rightful place, and in celebration, Grimlock destroyed Primacron's laboratory. Call of the Primitives

From Teletraan I: The Transformers Wiki, a Wikia wiki.