Originally posted by Penguin
IIRC the Transformers Movie is set in between the second and third transformers seasons. Rodimus announces the war is over but as the third season demonstrates its not. Optimus uses the matrix to do something which restores Cybertron, not the universe, to its original pre-war paradise like state.
Actually, you guys are thinking of two differant episodes. In the final two part episode to the Third Transformers season, "The Return of Optimus Prime", Prime does indeed use the Matrix to heal the universe of of a hate plague that makes everyone turn on each other.
In the 3 part episode right after that, "Rebirth", (which was meant to be the start of a fourth season that was later aborted) the power of the super-computer Vector Sigma (rather than the Matrix) is used to save the Earth after the Decepticons cause the sun to go nova. In the process, the excess energy drained off from the sun is used to restore Cybertron.
PS: in case you haven't guessed, Transformers are about the only thing that come close to WC as being the focus of my life.

Best, Raptor
Why? Nooooo! 