Transformers: Revenge of the Fallen

It is revealed that thousands of years ago there was a race of ancient Transformers who scoured the universe looking for energon sources. Known as the Dynasty of Primes, they used machines called Sun Harvesters to drain stars of their energy in order to convert it to energon and power Cybertron's AllSpark. The Primes agreed that life-bearing worlds would be spared, but in 17,000 BC, one brother, thereafter dubbed "The Fallen", constructed a Sun Harvester on Earth. The remaining brothers thus sacrificed their bodies in order to hide the Matrix of Leadership the key that activates the Sun Harvester from The Fallen, who swore to seek revenge upon Earth.

Decepticon Soundwave hacks into a US satellite and learns the locations of the dead Decepticon leader Megatron and another piece of the AllSpark. The Decepticons retrieve the shard and use it to resurrect Megatron, who flies into space and is reunited with Starscream and his master, The Fallen in the Nemesis.

After Prime's death, The Fallen is freed from his captivity and Megatron orders a full-scale assault on the planet. The Fallen speaks to the world and demands they surrender Sam to the Decepticons or they will continue their attack. Sam, Mikaela, Leo, Bumblebee, the twins and Wheelie regroup, and Leo suggests his online rival "RoboWarrior" may be of assistance. "RoboWarrior" is revealed to be former Sector 7 agent Simmons, who informs the group that the symbols should be readable for a Decepticon.

The Matrix is reassembled from the dust, and Sam uses it to revive Optimus. The Fallen arrives and overpower the autobot team before stealing the Matrix and activating the Sun Harvester unearthed by the Decepticon Devastator. In his final moments, Jetfire volunteers his parts and spark to Optimus. With enhanced capabilities, Optimus destroys the Sun Harvester and takes on Megatron and The Fallen, killing the latter. Sam then finally reciprocates Mikaela's love as Megatron and Starscream retreat and vow that their fight is not finished.
The film ends with Optimus sending a message into space saying that the humans and Transformers both share a common past.
During the end credits, Sam returns to college.