Super Mode

In Transformers Cybertron, Optimus Prime transforms into Super Mode. His trailer goes onto his back while two leg pieces connect to the blue part of his legs and his Mouth plate comes over his face. Optimus normally goes into Super Mode when fighting in battle against Megatron. He never went back into Super Mode in the final two episodes due to the fact of losing his right wing and his Mouthplate.

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