G.I. Joe vs. the Transformers 3: The Art of War

After a time-travelling adventure that pitted the heroic Transformers called the Autobots and G.I. Joe against the evil Transformers called the Decepticons, an agreement was made to decommission any Cybertronian technology on Earth in an effort to prevent it from falling into the wrong hands again. The G.I. Joe team was sent to guard a secret military base containing the Cybertron technology.

But unbeknownst to the Joes, they are also guarding a most dangerous -- and highly secret -- experiment...