Transformers: Cybertron premiered in 2005 as the third part of the Unicron Trilogy, following Armada and Energon, and was known in Japan as Galaxy Force. Its story follows the Autobots searching across planets for the Cyber Planet Keys to stop a black hole threatening Cybertron. The English opening became familiar to fans who grew up with the series on television and later shared clips in fan edits online. It remains used for nostalgic posts and tributes that celebrate the mid 2000s era of Transformers animation.