Not sure if this should go in the Photo Blitz, or the Fan-Fiction area, but it's a pretty short bio, so I'll lean towards photo blitz
In a universe that has fallen to the scourge of Tornedron, the burnt husk of Optimus Prime still houses the mighty Matrix of Leadership. With the universe a charred ruin, the Matrix travels back in time to change the one thing that might prevent Tornedron's existence. It must kill Optimus Prime...
*I bought the Target exclusive Construct-Bots Silver Knight Optimus, and after just having re-watched my favorite episode from the original Transformers series (Call of the Primitives), I had an idea for a story explaining who this silver Optimus Prime is. I'm guessing that in his timeline, Optimus Prime eventually defeated the planet-eater Unicron, necessitating the creation of Tornedron (as in the episode). So after Tornedron destroyed the universe, the remnants of the Matrix took over the dead body of Optimus Prime, and travelled back in time to kill Optimus Prime. This would distrupt the timeline, and prevent the creation of Tornedron.*