Antimatter

From Transformers Wiki

Antimatter is a powerful energy source, though somewhat unstable.

[edit] Fiction

[edit] Generation 1 cartoon continuity

Dr. Alcazar created an antimatter formula, which came to the attention of Megatron. Predictably, he wanted it as a source of energy. The doc deleted the formula, but sent it to Chip Chase. Ultimately, Megatron decided that antimatter was simply too unstable to use. Roll For It

[edit] Marvel Comics continuity

On the other hand, the Ark has an antimatter conversion chamber as part of its power system. All or Nothing!