Transformers Prime – Season 2 Volume 5: Advance on Cybertron TV series presented on DVD.
The Battle For Earth Reaches The Ultimate Stage
Optimus Prime is on the hunt to secure four extremely powerful Iacon relics known as the Omega Keys which, if discovered, could lead to the restoration of Cybertron. As the Decepticons and Autobots fight for control of the Omega Keys, the battle leads the warring Transformers to Cybertron and into a climatic confrontation to not only control their home planet but also decide the fate of humanity.
Includes episodes 21 – 26.