The sequel to Transformers Armada, Transformers Energon (Transformers Superlink in Japan) was concerned with the search for energon, the source of both Cybertronian factions' power. Although previous series had followed the integral plot of Autobots and Decepticons searching for energy, Energon was quite heavily obsessed with it. The series-wide gimmick was 'energon stars', little translucent plastic things that slotted into holes on the Transformers. The star acted as a magnifying glass, revealing a faction sigil at the bottom of the hole. Followed by Transformers Cybertron.