http://en.wikipedia.org/wiki/Transfo...the_Dark_Spark
Movieverse Drift battles his way through Lockdown's foot soldiers on Earth when the Autobots notice the 'mysterious purple meteor' fall. When it's found Optimus utters a cryptic "I feared this day would come" or something like that. Lockdown shows up nabs the meteorite/darkspark and escapes.
Flashback to Cybertron pre FoC. Megatron sends his lieutenants Soundwave, Shockwave and Starscream to retrieve the Dark Spark from the Crystal City.
Blah, blah, blah... Cue series of Decepticon and Autobot missions to track down/obtain/transport the Dark Spark
Megatron gets his hands on the Dark Spark, powers up. Fights Optimus. The Dark Spark is ejected out into space during the fight.
Flash forward to movieverse Earth again. Drift and Bumblebee locate and infiltrate Lockdown's base of operations. Drift gets taken captive. Out of nowhere, Grimlock breaks out of captivity and tears the place up. Lockdown escapes again with the Dark Spark to his second base where his Time Bridge is being built. Reveals his plan travel back in time to reignite the civil war (because peacetime is bad for bounty hunter business). Optimus confronts Lockdown in the final Boss Battle, wins and blasts the Dark Spark with the Matrix.
In the credits G1 Optimus sees the familiar purple meteor fall to Earth.
Any figure that comes with swords demands wrist articulation.