The Autobots learn of a Cybertronian spacecraft hidden on the moon, and race against the Decepticons to reach it and to learn its secrets. Sam Witwicky takes his first tenuous steps into adulthood while remaining a reluctant human ally of Autobot-leader Optimus Prime. The film centers around the space race between the USSR and the USA, suggesting there was a hidden Transformers role in it all that remains one of the planet's most dangerous secrets.