1924: Captain Witwicky is now in an insane asylum, plagued by visions of the Transformers bringing their war to our world.

1935: On the eve of his retirement, Agent Simmons visits Hoover Dam as it nears completion to see when the "Mega-Man" will be soon laid to rest. He remains convinced that others will come looking for the cube, and no amount of concrete will hide it.

2003: Sector 7 arrive in Virginia at the location where Bumblebee has just crashed on Earth. Watching CCTV tapes reveals the visitor has assumed the shape of a Camaro, but despite this knowledge they fail to capture him.

Young Sam Witwicky inherits his Great, Great Grandfather's possessions, but is unimpressed by their contents, whilst Bumblebee hacks into the Internet and learns of Captain Witwicky's claims about an Ice Man.

Sector 7 call in Agent Simmons, a specialist to help them capture the newly christened N.B.E.2. He formulates a plan to use a synthesized material to imitate the Cube's signal and lure the unaware alien into a trap.

But an unexpected spanner is thrown into his plan as three Decepticons arrive on Mars...